maiozee.blogg.se - She was nearly twenty with dark hair and darker eyes

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.

People with middling amounts of melanin sport hazel or green eyes.

People with very little melanin in their irises have blue or grey eyes.

People with a lot of melanin in their irises have brown eyes.

A pigment called melanin determines hue, and eye color develops in the eight or so weeks following birth. Where Eye Color Comes Fromįirst, a little bit about eye color. So is it always DNA-caused or can it happen for other reasons? Let’s have a look. It’s a rare phenomenon called heterochromia. Do you or does someone you know have different-colored eyes? When you meet someone with one blue and one brown eye, for example, it sometimes takes a minute to register why they may seem a little “not quite right.” But then, when you look a little closer, you see how beautiful and unique this trait is.