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Eye colour is an interaction of several genes. Each gene has two alleles, we get one from each parent. Generally, dark pigment, melanin, is dominant over a paler pigment. Blue eyes have less melanin than darker eyes. However, it is not a simple inheritance like tongue rolling which is governed by one set of genes.

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13y ago
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12y ago

Melanin, or lack of melanin.

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Q: What causes eyes to appear brown or blue?
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You have brown eyes but your sister has blue what causes this?

Well if you have brown eyes there is a gene in the family for brown eyes but if your sister has blue eyes there is both a brown eyed gene and a blue eyed gene in your family so you either got it from your mom or your dad


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Officially they are "blue" but his eyes appear a light gray or green in photographs.


Can to brown eye mom and dad have a kid with blue eyes?

Yes. If the mom and dad both have one recessive gene for blue eyes, there is a 25% chance that the child will have blue eyes. Since the blue eyed gene is hidden when the brown eyed gene is present, the parents will appear to have brown eyes even if they still contain the gene.


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They appear to be different. The right is brown and the left is blueish.


What do blue eyes lack?

Brown.... blue eyes lack brown....


Is brown eyes dominate or is blue?

Brown eyes are dominant.


Which are hotter brown eyes or blue eyes?

Definitely brown eyes on a guy and blue eyes on a girl. But its your opinion.


What color are Terry Fox's eyes?

his eyes are blue


Did Native Americans have blue eyes?

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Brown eyes are dominant Cross a homozygous brown with a recessive blue What color eyes will the offspring have?

all brown the chances of brown eyes both parents have to have blueeyes for blue eyes to become dominant but its still possible no matter what for blue or brown


What color will your baby's eyes be if the father has br eyes and br hair and mother has br hair and br eyes but the fathers dad has blue eyes and blonde hair?

Well it depends also what color eye the mother's parents or any of the parents siblings have. Mother's Parents (both brown eyes) 5.1% blue eyes & 8.5% green eyes & 86.3% brown eyes Mother's Parents (green eyes & brown eyes) 7.8% blue eyes & 17.1& green eyes & 75% brown eyes Mother Parents (blue eyes & brown eyes) 14% blue eyes & 10.9% green eyes & 75% brown eyes Throwing siblings into the mix Mother's Parents (both brown eyes) Mother's Siblings (blue & green eyes) 8.0% blue eyes & 8.6% green eyes & 83.3% brown eyes Mother's Parents (both brown eyes) Mother's Siblings (blue eyes) 8.0% blue eyes & 8.6% green eyes & 83.3% brown eyes Mother's Parents (both brown eyes) Mother's Siblings (green eyes) 5.8% blue eyes & 10.8% green eyes & 83.3% brown eyes ...and so on