Why we have blue eyes?

Answer 1

Blue depends on the genotype, or the two specific genes that a person has for that trait. "Blue" is a phenotype, or the way those two genes work together to express the trait. You can never know for certain whether a brown-eyed person is a heterozygote (two different genes for eye color) or a homozygote (both genes for brown eye color) because brown is always dominant to all other colors. We do not have a genetic test to confirm whether the brown-eyed person is heterozygous or homozygous, so we can never say for certain what the outcome will be, but only express it in probabilities. In addition, mutation can occur that changes the eye color from the possible genotypes of the parents, anyway, although this is extremely rare. Some genetic syndromes are associated with eye color regardless of the parents' genotypes.

Answer 2

haha - actually blue eyes are the definition of INBRED!! lol. ever take a class in genetics?? blue eyes are recessive... so that means both parents have to have 2 alleles for it....both parents have to have the same genes for that trait. if they were different (and varied in the population) they'd have brown eyes - and NOT be "inbred" as you nicely put it...manchestaguy

of course i love blue eyes and i wish i had them. i just think it's funny that you don't know the first thing of genetics and make a comment like it came right out of hitler's aryan nation speech.

anyway, here is the real deal:
At the present, three gene pairs controlling human eye color are known. Two of the gene pairs occur on chromosome pair 15 and one occurs on chromosome pair 19. The bey 2 gene, on chromosome 15, has a brown and a blue allele. A second gene, located on chromosome 19 (the gey gene) has a blue and a green allele. A third gene, bey 1, located on chromosome 15, is a central brown eye color gene.

Geneticists have designed a model using the bey 2 and gey gene pairs that explains the inheritance of blue, green and brown eyes. In this model the bey 2 gene has a brown and a blue allele. The brown allele is always dominant over the blue allele so even if a person is heterozygous (one brown and one blue allele) for the bey 2 gene on chromosome 15 the brown allele will be expressed.


-- so like i said, brown eyes dominate over blue on the bey 2 gene.. and you need 2 blue alleles to get blue eyes. (aka more inbred than with brown eyes)

Answer 3

Because of our genetics...In my own family, my dad had blue/my mom had brown and out of 6 kids, 3 had blue/3 had brown...You have a 50-50 chance of having blue in that situation.

Answer 4

It has to do with getetics. i learned in Biology last year that it is the domant color and so if one of your parents have blue and the other has brown you will be more likely to inherit the blue eyes. i hope that helped

Answer 5

because Eve were carrying gene of Blue eyes.....

)))

Adam and Eve had all genes which live all over the world now....

Answer 6

i have green eyes

Answer 7

I don't...mine are green.

Answer 8

don't know you!