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What About Eye Color?
One thing that makes humans the same and different all at once it our eye color. Each human has eyes but the color of them can vary. The most common eye color is brown but it can vary between a very dark brown that without proper lighting resembles black, all the way to a golden-amber shade. Although people who have different ancestry such as European background, they may have more of a chance to possess a shade of hazel, green, or gray as their eye color.

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What this video above is explaining to us by using a Punnette square to demonstrate the probability rate of the eye colour you will receive if one of your parents is browned eyed and the other is blue eyed. You can use the Punnette square method for other scenarios as well. In the photo below it shows many different scenarios of a few different colours of eyes. It also proves of what I said earlier that more times than not the chance of getting brown eyes likelier.



But eye color goes into more depth than just that. Yes the eye color of your parent s plays a role in creating the color of your eyes such as brown is dominant over blue but really it goes beyond that. There is one gene that controls almost 75% of what the color of your eyes will end up being. This gene is called OCA2 (oculocutaneous albinism ||) which is also referred to as the P gene. This gene provides instructions for making a certain protein which is named the P protein. It is found in melanocytes which are specialized cells that form a pigment called melanin in the iris. On a side not, this is the same pigment in deciding the colour of your hair and skin. There are two types of melanin; eumelanin and pheomelanin. The first one is a dark pigment and the other is lighter similar to a yellow-red colour. Together they are both found in the eye cells. What forms your eye colour is the ratio of each in the iris. If there is more of melanin made up of eumelanin compared to pheomelanin, your eyes will be a darker shade. If you have lighter eyes it is because there isn’t a lot of melanin in the eye cells which the picture below shows.

Another thing that is interesting about eyes if there isn’t enough already is, heterochromia iridis. What that term is is when one person has two different coloured eyes. It isn't a common thing but when it does happen it is linked back to genetics and also a lack of melanin in the eye cells. There are 3 types of heterochromia; complete, central and sectoral. Complete is when both eyes are fully two different colours. Whereas sectoral is when there is a bit of another colour mixed in with the actual shade. And finally, central is when there is a ring of another colour compared to the main colour around the pupil.

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