If my uncle has bright green eyes, and his wife has greenish hazel eyes that are much more greenish

Question

Then how can they have a son with black eyes; they had many kids all colored, except him. How could that work?

Answer 1

very random question hannah,u mustr have been really bored...

because the gene for black eyes could have skiped all the other kids and parents, and the poor kid got stuck with it....

Answer 2

Could work in a bunch of ways...

A. Both parents could be carrying a recessive trait (for black eyes)

B. Mutation in the gametes' genes for eye color

C. Eye color could be a polygenic trait, a couple of recessives could have overlapped in effect to yield black eye color

D. Environmental effects could shape the phenotype of an organism as much as genetics (i.e. lack of green eye making pigment in organism's food).

E. Other possibilities...

Answer 3

Genetics is not a + b.

Answer 4

As others have mentioned there are many factors that contribute to eye color and genetics are not simple.  But most people have some color to there iris, whether it be very very light, or very very dark.  Black irises are not a normal color for eyes to be, they may be really really dark brown, but there is a condition called Aniridia which is really rare, but causes the eyes to look black, or as if they are just a large pupil.  The condition is commonly autosomal dominant, meaning one parent would have to have it, but there are rare forms of it that are autosomal recessive.  I have never seen a person with eyes like this, but it would be very interesting to see, just like a person with two different colored eyes or two different colors in one eye!

Here is where I got some of the info and it also contains more:

http://en.wikipedia.org/wiki/Aniridia