![]() “One Common Ancestor Behind Blue Eyes.” LiveScience. “7 Beautiful Mutations: Which Ones Do You Have?” XoVain. Our friendly, expert representatives are ready and happy to help. Get answers anytime by visiting our Help Center. ![]() If you or someone you know is lucky enough to have different-colored eyes, embrace its unique look!įollow us on Facebook and Twitter ! If you have questions about paternity tests or other DNA testing services, please contact our Client Support Center at 88, Mon-Fri from 9 AM to 6 PM Eastern Time. Our bodies are wonderful things, and little blips in our DNA can sometimes have physical consequences-like double eyelashes! Over time, genetic mutations are no longer mutations at all, but are considered ‘normal’-like blue eyes. Too often, a mother might say, “But my child looks just like this man I slept with and not like the other one,” only to find out through DNA testing that the child is the biological offspring of the man he/she looks nothing like! So be very careful about making assumptions about a biological relationship based only on heterochromia. Keep in mind that traits like heterochromia or other physical characteristics are never absolute proof of paternity-a DNA paternity test is a much more scientific and reliable resource for determining a biological relationship. Injury: Heterochromia that happens later in life is usually caused by eye injuries or specific types of medication.Ĭhimera: Under extremely rare circumstances, a person could be a chimera (when they contain separate DNA from an undeveloped twin) and have eyes with different colors as a result. Genetic Mutation: Sometimes, a mutation in one of the genes regulating eye color may occur during embryonic development.ĭisease: There are certain diseases such as Horner Syndrome that may cause heterochromia during a person’s lifetime. Trauma during Birth: If facial trauma occurs around the time birth, it may prevent melanin from ‘coloring’ the eye in the affected area of the face. In fact, since it’s a dominant autosomal trait, chances are good one of the person’s parents has it too. Do you or someone you know have different-colored eyes? If so, this unique characteristic most likely happened from one of the reasons listed below.įamily DNA: Usually, if the trait is apparent from babyhood, then it came from the family gene pool. There are lots of different reasons! In the vast majority of cases, people are born with different-colored eyes, but there are times when heterochromia is caused by something else. Central (a different color surrounds the pupil). ![]() Sectoral (a segment of one or both irises is a different color).Complete (each eye is a different color).There are actually three distinct categories of heterochromia, although some people may have a combination of two or three: ‘Heterochromia’ is a Latin term meaning ‘different colors,’ which perfectly describes this trait. That original mutation ended up greatly affecting the world’s DNA pool, didn’t it? FUN FACT: Did you know that blue eyes were originally caused by a genetic mutation some 6,000 to 10,000 years ago? Scientists believe that everyone originally had brown eyes. Which brings us to folks who have two different-colored eyes. ![]() Today’s scientists believe that two genes control eye color (not just one), and it is how these genes interact that provides the full range of colors in people’s peepers. Newborns’ eyes all look blue because it takes weeks for the genetically-designated amount of melanin to ‘color in’ their irises.
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