The Frequency Usage tab displays channel visualizations for the 2.4GHz band and each sub-set of the 5GHz band. The Access Point Signal Graph tab shows a line graph of the signal levels for each SSID selected. One feature we liked allows saving notes to individual SSIDs, which are then included in any data exports. Additionally, it does not reveal the actual hidden SSIDs, but does show the other network details of hidden SSIDs. It doesn’t display the 802.11 standard of each SSID, but it does show the supported data rates and the multiple channels used by any SSIDs with larger channel-widths. The Access Points tab shows many essential details. The first tab, Adapter Overview, displays a listing of all the network adapters and their IP gateway and MAC addresses. This utility has a simple GUI that resembles more of a multi-tabbed dialog box than a full application. Other than showing basic network and signal details, it supports GPS and other geolocation detection. Homedale is a relatively simple and portable Windows-based stumbler with an optional command-line interface. Though it lacks any advanced features, it could be used for small networks or to give an idea of how these map-based tools work. We found Ekahau HeatMapper to be a very simplistic map-based Wi-Fi survey tool. The only export or saving functionality of the app is taking a simple screenshot of the heatmap. When hovering over the heatmap areas, it shows a tooltip pop-up with the signal level range in negative dBm values. After it captures some data, hovering over the AP icons shows their individual coverages. It will automatically estimate access point (AP) locations and place them onto the map. Like other map-based survey tools, you click your location on the map as you walk around the building so it can generate the heatmap. The app shows 802.11ac networks as 802.11n. It includes the main network details, but lacks the signal levels in dBm and percentage values. The left side of the main screen displays a listing of the SSIDs and their details that is sortable by signal, channel, SSID, MAC address and security method. The app offers the option to create a floorplan or layout of the building being surveyed or a grid layout for a rough guideline. It shows similar network details as a Wi-Fi stumbler, but also generates a heatmap of the Wi-Fi so you can visualize the signal levels. Ekahau HeatMapper (Windows)Įkahau HeatMapper is a free map-based site survey tool for home-use, a slimmed down version of their professional product. But it certainly would be useful when performing penetration testing. Most of status and data captured can be exported into a simple text file.ĭue to lacking graphs and inability to distinguish 802.11ac APs and larger channel-widths, Cain & Abel might not be a great choice for general Wi-Fi stumbling and surveying. Like Acrylic WiFi, any hidden SSIDs discovered from packets are revealed in the GUI as well. For SSIDs and clients the stumbler provides numbers of certain packets detected: all packets, unique WEP IVs and ARP requests. In addition to the typical SSID and signal info, it shows a list of and details for the connected clients. The Wireless tab is where the Wi-Fi stumbler resides. The main portion of the application is tabbed clicking the tabs shows the different utilities. It has an old-style toolbar on the top with icons to bring up different utilities. Its GUI has an older, simplistic look and feel. Like Acrylic WiFi, it also has a monitor or promiscuous mode to capture more traffic. Cain & Abel (Windows)Ĭain & Abel is a multi-purpose password recovery and cracking application that also features Wi-Fi stumbling, sniffing and cracking tools. It would be nice if they offered better data exporting, however. It displays both textual and graphical details, which is great for simple Wi-Fi surveying needs. Overall, Acrylic Wi-Fi Home Free is a solid Wi-Fi stumbler given that it costs nothing. There’s also a Tweet feature to post a screenshot to Twitter. Is displays channel usage, including channel-bonding, and signal strength at the same time.įor exporting or saving the captured data, the application is limited to copying up to one row of data to the clipboard and pasting the plain text into a text document or spreadsheet. Though a bit hidden, there’s an advanced mode that displays two additional graphs, one for 2.4GHz and one for 5GHz. By default, the bottom portion of the application shows the network ratings of the selected SSID, and one graph showing each SSID’s signal strength.
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Medical help: when to get it for children with insomnia caffeine – for example, energy drinks, coffee, tea, chocolate or cola.medicines that might make children more alert – for example, antidepressants or medicines used to treat attention deficit hyperactivity disorder.illnesses that make it hard to sleep well – for example, colds or ear infections.medical conditions – for example, asthma, sleep apnoea or restless leg syndrome.environmental factors – for example, a hot or noisy sleeping environment.emotional issues – for example, stress, child anxiety, child depression, teenage anxiety or teenage depression.bedtime behaviour – for example, too much screen time before bed or not enough time for calm, quiet activities in the bedtime routine.sleep associations – for example, when a child can’t go to sleep without a bottle of milk, a parent nearby or music in the background.When children go to bed later, they’ll often get up later in the morning too. Your child might not feel sleepy until around 11 pm or later, so they’ll want to go to bed later at night. This affects your child’s circadian rhythm. Insomnia is common in adolescence because this is when your child starts to release melatonin later at night than they did in childhood. struggle to concentrate or remember information.lack energy or constantly feel tired in the day. sleep at different times from day to day.nap for long periods during the day or fall asleep at school.struggle to wake or refuse to get out of bed in the morning.often wake up during the night and can’t go back to sleep.feel tired but are suddenly wide awake once they go to bed.often get out of bed and ask for things.But if you’re concerned that your child might have insomnia, there are signs you can watch for at bedtime, during the night and during the day. Signs and symptoms of insomniaĪ change in your child’s sleeping behaviour – like going to bed later than you’d like – isn’t necessarily a sleep problem. The amount of sleep your child needs to be at their best for play, learning and concentration during the day depends on their age. This is also called persistent or chronic insomnia. Long-term insomnia is when your child has trouble sleeping at least 3 times a week, and this problem lasts for a month or longer. Short-term insomnia lasts only a few days or weeks. If your child has insomnia, it means they have trouble getting to sleep or staying asleep at night, or they might wake up too early. If something as twisted and playful as "Knights of Cydonia" can be a radio hit, then who knows what the casual music consumer is willing to embrace. Personally, I'm glad these guys are still getting spun. If you had your idea of what Muse could become, or what they should have been, then your listening experience was doomed from the start. If you came for the melodrama, for the double octave riffs, for what Muse is essentially all about, then you will be thoroughly satisfied. Naysayers will surely hone in on the beefier tracks, and to be fair, being pounded with verse after verse of high-fidelity distortion can become grating, but at the same time you have to question why you're listening to Black Holes and Revelations in the first place. The formula is undeniably moving, particularly when stripped of the heavily produced thud of drum and bass. Similarly, "Soldiers Poem" breaks up the album's rhythm-heavy middle section with a delicate acoustic number, spiced with a brief passage of Freddie Mercury harmony. The choice to follow the proggiest song with the poppiest was a carefully considered one, I'm sure. Muse - Black Holes and Revelations Lyrics and Tracklist Genius Album Black Holes and Revelations Muse Released JBlack Holes and Revelations Tracklist 1 Take a Bow Lyrics. the lyrics of Muses album Black Holes and Revelations realized in the wordings of the clause if analyzed based on the elements of interpersonal meaning. Such a dynamic musical discharge only highlights other tracks' comparatively standard pop/rock sensibilities. The album is a black hole of pomp and nothingness, a perfect document of the times. It builds around a tense verse of what I'm assuming is anti-Bush sentiment, and releases with enough genuine bombast to last the entire album. Black Holes & Revelations Import, Extra Tracks Muse Format: Audio CD 2,588 ratings 2821 See all 17 formats and editions Streaming Unlimited MP3 9.49 Listen with our Free App Audio CD 28.21 3 Used from 28.21 1 New from 62.99 Vinyl from 21.85 3 Used from 21.85 21 New from 21.90 First-pressing-only CD+DVD Edition of the 2006 Album. It was recorded over four months with producer Rich Costey in New York City, London, Milan, and southern France. Muse seems content attempting to craft their perfect record, and within an established formula, they are certainly getting there.īlack Holes flows seamlessly, starting strong with "Take a Bow," my favorite track on the album. Black Holes and Revelations is the fourth studio album by English rock band Muse, first released on 3 July 2006 through Warner Bros. Black Holes and Revelations is probably the least restrained album of 2006, which for some is a blessing, for others a pretentious annoyance. He likes to combine major and minor chords in pleasing ways, and he likes to rock out. Matthew Bellamy is a British man with an extremely flexible vocal range. So, right off the bat, the whole Radiohead comparison thing? It's redundant. A&E Records Limited ( not for release label use for copyrights use only) (in 2006) mixed at: Townhouse Studios in Shepherd's Bush, Hammersmith and Fulham, London ( Greater London), England, United Kingdom. At this point in their career, Muse are making exactly the kind of music they want to make.
But the Tortuga appears to shrug it all off with ease. Personally, it still makes me nervous to see the Tortuga traveling on the luggage belt toward mysterious machines and conveyors beneath the airport-all of which, in my imagination, are waiting to tear the hip belt from the bag or slice open the sailcloth exterior. But after years of testing, traveling with, and occasionally checking our bag, we haven’t had an issue. Some people, especially those who are hard on their gear, may consider not being able to remove or stow the Tortuga’s straps (as they can with our other picks, like the Cotopaxi) a disqualifying factor. Across moderate distances, these straps do help with the bag’s overall weight. This design (with its included load-adjuster straps at the top, to prevent the bag’s weight from sagging toward your lumbar region) is the best of those we’ve tested at distributing the weight of an otherwise fairly heavy bag. Both sizes of the Outbreaker are adjustable for torso length, which means you can manipulate the location of the shoulder straps (video) to fit a wider variety of body sizes. The more-diminutive version is a decent choice for weekend travel or for minimalist travelers-but for this size, we prefer the space-saving profile of the Allpa. The Outbreaker is available as a 45-liter bag (the max space for a carry-on bag), which we tested, along with the 35-liter version, which is compliant with some intra-European flights. And that’s despite the bag’s hefty (just over 5 pounds) weight when empty-it’s roughly 2 pounds more than most of our other picks, except the Peak Design Travel Backpack. Just as important, thanks to the adjustable torso length, shoulder straps, and waist-belt system (borrowed from hiking backpacks), the Outbreaker is the most adjustable bag we’ve tested three years in a row. That’s why we have picks that are great for people traveling for work, others designed to be carried over long distances, and budget options for travelers who want to give the one-bag strategy a try. However, finding the right bag is a personal choice, and no single bag will appeal to everyone. This is not a style of packing that’s for everyone, but once some people try it, they’re forever hooked. Though these backpacks are great as companion bags for any trip, they’re designed to ultimately replace all of your other luggage and become your exclusive bag as you travel. Both bags are exemplary carry-on travel backpacks that are designed for comfort, durability, and organization. In the end, we chose two as our top picks: the Cotopaxi Allpa 35L (for most trips) and the larger Peak Design Travel Backpack 45L. We spent six months testing 22 bags and flying across the country with all of our picks. Gear in the rolling bag: Drysuit (plus underwear) or wetsuit, Sartek cave lighthead & battery canister, fins, 2 masks, Rockboots, 2 Scout lights, 2 foot square chunk of eggcrate foam to protect light & canister, 2 beach towels, hooded wetsuit vest, 2 sets of wings, 1 BP & harness, batteries, mesh duffle bag, dry box, neoprene bootie inserts for the Rockboots, and a few other odds and ends.Some internal pockets are useful, but major organizing is better managed on your own with packing cubes. The rolling adventure duffle holds all my gear and the next size small shoulder duffle holds all my clothes, etc with room to spare.Īnd for those of you wanting to know just how much gear fits. I do think my $49 & $99 was well spent over 6 years ago. I am now the proud owner of TWO BRAND SPANKING NEW BAGS at no additional cost to me other than what I paid for them in 1998!! No questions asked, I just received the new bags via FEDEX. I sent both bags back to LLBean about 2 weeks ago with a request to assess repair costs and advise. On my last trip to Akumal, the baggage gorillas snapped the plastic runners off the bottom of the bag AND put holes in the top of my matching one size smaller LLBean Adventure duffle for clothes (This happened once before.they put a 3-corner tear in the cordura, LLBean repaired at no charge) Okay.I've used this bag several times since.British Columbia, Akumal x 3, & Cayman Brac to name a few. They put my initials on the bag and sent it to me with their blessing. The pressed board in the bottom was splintered and actually broken in half! I sent the duffle back to LLBean and they replaced it with a new flexible, yet firm plastic bottom in the color of solid black (my choice, they called me, didn't make orange anymore). The airport luggage gorillas broke the bag in half on my return flight. Orange & Black so I can find it quickly in baggage claim. I purchased the LLBean Rolling Adventure Duffle (size XL) back in 1998 before I went to Costa Rica. Yes, this is blatant product endorsement.BUT, from a very happy satified customer! 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Launch containers with hypervisor isolationĭeploy and operate always-on, scalable, distributed appsīuild, store, secure, and replicate container images and artifacts Run containerized web apps on Windows and Linux Provision unused compute capacity at deep discounts to run interruptible workloadsīuild and deploy modern apps and microservices using serverless containersĭevelop and manage your containerized applications faster with integrated toolsĭeploy and scale containers on managed Red Hat OpenShift Migrate SQL Server workloads to the cloud at lower total cost of ownership (TCO) Manage and scale up to thousands of Linux and Windows VMsīuild and deploy Spring Boot applications with a fully managed service from Microsoft and VMwareĪ dedicated physical server to host your Azure VMs for Windows and LinuxĬloud-scale job scheduling and compute management Remove data silos and deliver business insights from massive datasetsĪccess cloud compute capacity and scale on demand-and only pay for the resources you use Secure, develop, and operate infrastructure, apps, and Azure services anywhere Jump in and explore a diverse selection of today's quantum hardware, software, and solutions Quickly create powerful cloud apps for web and mobileĮverything you need to build and operate a live game on one platformĮxecute event-driven serverless code functions with an end-to-end development experience Migrate, modernize, and innovate on the modern SQL family of cloud databasesīuild or modernize scalable, high-performance appsĭeploy and scale containers on managed KubernetesĪdd cognitive capabilities to apps with APIs and AI services Provision Windows and Linux VMs in secondsĮnable a secure, remote desktop experience from anywhere Explore some of the most popular Azure products Be the best.Are you looking for a quick trip to fame and success? Or, are you looking for some red flags on your route that you will want to avoid as you journey through this amazing and crazy thing called the music world? Don't get distracted by clubbing, updating your social networking, or doing things that happen off the field. If you're an athlete, stay focused on keeping in shape and keeping your game at the highest possible level.Embrace causes that will have you on the right side of history, rather than chasing votes with minute-by-minute opinion poles. If you're a politician, diversify your interests and be willing to change with the times.Don't go for the cheap and commercial buck. Take time on your recordings and on your performances. If you’re a musician or another kind of performer, challenge yourself to keep the consistency of your music high.Think of Sean Penn in Milk, Daniel Day-Lewis in My Left Foot, and Charlize Theron in Monster. If you’re an actor, take on diverse roles and do things that will challenge your fans’ conception of you as a performer.But real stars can learn to negotiate their careers to string it into a lifetime of challenging, engaging, and exciting work that people will enjoy watching and living vicariously through for years to come. Celebrities come and go, grabbing their 15 minutes of fame and disappearing just as quickly. Once you've climbed and scrabbled your way to the top, it's important to stay busy. Stay close to the action.Ĭontinue challenging yourself in your work. Be a roadie and learn what life on tour is like. Learn to run live sound and help out at a venue, or get a job selling merch for a band you like. Musicians would do well to work for and with other bands.Tear tickets at Yankee stadium and you may be on the infield someday. Work as an usher to get into the games for free, or work the concessions. Athletes should work in coaching, or work in stadiums fulfilling other jobs.Volunteer your time for politicians you believe in and make contacts that will help you in your political career. Politicians generally start out working for other campaigns.You may want to act, eventually, but if you could put your skills to work as a make-up artist, as a back-up cameraman, as a lighting crew member, you'll be that much closer, and you'll be working. Seat-filling, extra-work, and tech-crew stuff is all a common part of Hollywood. Want to crack into making movies and get your name in lights? Get a job working as a gaffer.Just get your foot in the door and have the confidence that your talent will carry you the rest of the way. Make the initial contacts with the people who matter in your industry by starting out on the bottom. The first and in many ways the most challenging aspect of being a star is to get noticed. Do love to pretend? Do you enjoy movies, plays, and television? Do people ever tell you that you have a dramatic presence? If you're a good actor or actress, movie stardom might be in the cards.Do you have the gift of gab? Are you a convincing and organizing presence, a leader among your friends? Does everyone listen to what you have to say? If so, you might have the makings of a politician.Do you love music? Do you enjoy singing, playing an instrument, or dancing to music, you might have the makings of a pop star, a singer, or a rock star.Are you a gifted athlete? When you and your friends get together to play sports, are you always the first picked, or the one to score the most points? If so, you might have the makings of a sports star.What will be the thing that people recognize you for? What's the skill, ability, or talent that will take you to the top? Think about what things come easiest to you, and listen to other people for advice to find your star-making quality. If you want to be a star, you've got to specialize. Find a talent that suits your natural abilities. Yes Theorem 8.3: If two angles are complementary to the same angle, then these two angles are congruent. This resource contains 7 coordinate geometry proofs, plus the typed up solution key. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution License. Answer Key This provides the answers and solutions for the Put Me in, Coach exercise boxes, organized by sections. Find step-by-step solutions and answers to Geometry - 9780133500417, as well as thousands of textbooks so you can move forward with confidence. Use the information below to generate a citation. Then you must include on every digital page view the following attribution: If you are redistributing all or part of this book in a digital format, Then you must include on every physical page the following attribution: If you are redistributing all or part of this book in a print format, These worksheets explains how to do coordinate geometry proofs with triangles and quadrilaterals. if and only ifPlies on the circumcircle of4ABC. Coordinate Geometry Proofs Worksheets - Easy Teacher Worksheets. X,Y,Zare collinear if and only ifx2+y2 1, i.e. What happened and why Centroid stays the same. Geometry Proof Worksheet (3) Answer Key added by request. Findthe coordinates of the centroid of the 3) (9, smaller triangle. We will be taking a closer look at this in a little bit.Want to cite, share, or modify this book? This book uses the Download Geometry Proof Worksheet (3) Answer Key: FileName. The following practice questions ask you to apply the midpoint and slope formulas to prove different facts about two different quadrilaterals. It's then your job to prove that these sides have the right properties of a parallelogram. Coordinate geometry proofs require an understanding of the properties of shapes such as triangles, quadrilaterals, and other polygons. Classify shapes on the coordinate plane: justify your answer. 7.) Quadrilateral MATH is a trapezoid because there is one set of parallel sides, and one set of non-parallel sides. 6.) Rhombus KATE is a square because the diagonals are the same length. Prove: PQRS is a parallelogram using slopes. 5.) Quadrilateral MATH is a trapezoid because there is one set of parallel sides, and one set of non-parallel sides. While more than one method of proof, or presentation, is possible, only one possible answer will be shown for each question. Some problems specify a method, while others leave the choice of method up to you. Most times, when you're asked to prove that a certain quadrilateral is a parallelogram, you'll be given information about just a few sides. Proofs involving corresponding parts of congruent triangles. Directions: Prepare a coordinate geometry proof for each problem. You can only say for sure that this is a parallelogram with a mathematical proof. The coordinates of the midsegment triangle are (-2,4), (-3,2), and (-6,4). This is where mathematical proofs are very important. Answer Key Expressing Properties: Coordinate Proofs 1. Looking at this shape, you might think that it is a parallelogram, but unless the problem specifically tells you and/or you can prove that it is, you can't say for sure that it's a parallelogram. A parallelogram is a quadrilateral with two pairs of opposite, parallel sides. Remember that a quadrilateral is a four-sided flat shape. For example, you might be shown a quadrilateral and be asked to prove that it is a parallelogram. In geometry, you'll often be asked to prove that a certain shape is, indeed, that certain shape. When it comes to geometry, it is the same. When it comes to math, you have to be able to prove that what you're doing is correct. Christian Object number 2014.74.3 Restrictions & Rights No Known Copyright Restrictions Proper usage is the responsibility of the user. Place used New Orleans, Louisiana, United States, North and Central America Classification Adornment Type pins (jewelry) Topic Associations and institutions Clothing and dress Education Fraternities Men Credit Line Collection of the Smithsonian National Museum of African American History and Culture, Gift of Kevin A. E.A." Lettering inscribed across the bottom reads "10K" and "12-10-53." This piece has a diagonal bar pin across the back. Hamilton Creative Designs new signature Blu & White collection is an online one stop shop for the Men of Phi Beta Sigma and the Soo Sweet Ladies of Zeta. The back has lettering inscribed across the top reads "E.M. Phi Beta Sigma Fraternity Pins 7.95 as low as 6.95 Sigma Gamma Rho Sorority Pins 7.95 Zeta Phi Beta 6.95 OES Shield 3-D Pin 6.95 as low as 5.56 Masonic Shield 3-D Pin 6.95 as low as 5.56 Masonic Compass Lapel Pin 6.95 as low as 5. Phi is set with twelve round, white pearls. This gold-colored metal pin has a two-tiered design, with the Greek letter Phi (F) centered atop the letters Beta (B) and Sigma (S). More fraternity and sorority badges, pins, and more 2023 Frat Pin Shopify Theme by Mile High Themes Powered by Shopify. (1.1 × 1.9 × 0.6 cm) Description Phi Beta Sigma fraternity pin from the Epsilon Alpha Chapter at Dillard Univerisity, New Orleans. PHI BETA SIGMA FRATERNITY Key Chain l LOVE PHI BETA SIGMA KEY CHAIN 1914 10.00 6.10 shipping Large Vintage Fraternity Key PI TAU SIGMA Solid Brass Antique Deco Decoration 54.95 Free shipping or Best Offer Phi Kappa Phi K Honor Society Fraternity Member Key Pin Badge 14. Phi Beta Sigma, Tri Beta chapter at Clayton State University. Discover (and save) your own Pins on Pinterest. Upon request, Seller can give you the business’s Georgia Sales Tax ID.On View Making a Way Gallery Museum Maps Objects in this Location Exhibition Making a Way Out of No Way Manufactured by Unidentified Subject of Phi Beta Sigma Fraternity, American, founded 1914 Date 1953 Medium metal and pearl Dimensions H x W: 7/16 × 3/4 × 1/4 in. This Pin was discovered by Eric Williams. Customer Service My Account FAQs Policies. where you can find all the Greek apparel and merchandise you need to represent your Fraternity & Sorority around campus or out on the town. Check Out Our Top Sellers Click Here To Shop. At the top of the ring you have founded and the bottom 1914, and around the top you have twelve stones that represent our founding twelve Brothers. Phi Beta Sigma Shield With Greek Letters Pin Shield With Greek Letters Pin. Attention GEORGIA RESIDENTS Sales Tax will be charged to buyers located in Georgia As required by law, this eBay Seller charges State Sales Tax plus County Tax to buyers whose shipping address is in Georgia. On the top of the Ring you have our three Greek letters -Phi Beta Sigma Under each you have three stones that represent our Founders. Edgar Smith and Frances Hall What was originally Sigma Light was call TaBroMo What are the Fraternity Ideals Brother, Scholarship and Service Nine founding members at Howard University Samuel P. 100% Money Back Guarantee! Please contact us ASAP if you have any problems or issues with your order. What is Phi Beta Sigmas Motto Culture for Service and Service for Humanity The Sigma Light was Originally Published by J. Import duties, taxes and charges are not included in the item price or domestic shipping charges Return Policy Return the item in 30 days and your money will be refunded. Shipping Info Domestic Buyers: Free Standard Shipping International Buyers: Prior to bidding or buying, please use the eBay shipping calculator to determine the shipping charges to your country. Item Phi Beta Sigma 10k Gold with 12 Pearl Fraternity Pin (with case) This badge measures 11.6mm tall, 17.2mm wide Phi Beta Sigma was founded in 1914 at Howard University by a group of African American males who felt the need of embracing the principles of brotherhood, scholarship, and service - which are expressed in the fraternity's motto "Culture for Service and Service for Humanity." The badge is a monogram of the Greek letters with 12 genuine pearls around a Phi. on the pins, Delta Psi, Delta Sigma Pi, Phi Beta Kappa, Phi Mu Alpha. Small Business Phi Beta Sigma New Classic Phi Beta Sigma Fraternity Color Face Watch w/Shield 4.4 (11) 4999 FREE delivery Mar 20 - 22 Or fastest delivery Mar 16 - 17 Another way to buy 4799 7.99 delivery Wed, Mar 15 Only 4 left in stock - order soon. Item: 152522154950 Phi Beta Sigma 10k Gold with 12 Pearl Fraternity Pin (with case). the neatly-arranged shaving articles and collection of fraternity pins and a. The total number of genes that contribute to eye color is unknown, but there are a few likely candidates. These genes are sought by studying small changes in the genes themselves and in neighboring genes, called single-nucleotide polymorphisms or SNPs. Genetic determinationĮye color is an inherited trait determined by multiple genes. However, OCA2 gene polymorphism, close to proximal 5' regulatory region, explains most human eye-color variation. The genetics of eye color are so complex that almost any parent-child combination of eye colors can occur. The earlier belief that blue eye color is a simple recessive trait has been shown to be incorrect. Some of the eye-color genes include OCA2 and HERC2. As of 2010, as many as 16 genes have been associated with eye color inheritance. The genetics and inheritance of eye color in humans is complicated. Humans and other animals have many phenotypic variations in eye color. The brightly colored eyes of many bird species result from the presence of other pigments, such as pteridines, purines, and carotenoids. This is an example of structural color, which depends on the lighting conditions, especially for lighter-colored eyes. Neither blue nor green pigments are present in the human iris or vitreous humour. The appearance of blue, green, and hazel eyes results from the Tyndall scattering of light in the stroma, a phenomenon similar to Rayleigh scattering which accounts for the blue sky. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in the iris pigment epithelium (located on the back of the iris), the melanin content within the iris stroma (located at the front of the iris), and the cellular density of the stroma. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. |