How is it possible....?

Question

Both of my uncles have blue eyes and my mom and 2 aunts have brown so did my grandparents.How did they come out with blue eyes when neither of thier parents had them?

Answer 1

Someone further back in the family must have had blue eyes. Maybe your great grandparents.

Answer 2

it came from an earlier generation. like a great or great great grandparent.

Answer 3

because both your grandparents had both the brown and blue eye genome. since brown eyes are dominant, then the brown genome was expressed for them. but this created a 1/4 chance that their their kid recieved only blue eyed genomes.

http://upload.wikimedia.org/wikipedia/co...

in this diagram, the little r's are the recessive gene. they are only expressed when there are two of these. the big R's are the dominant gene. this is expressed if there are two or one of them. if there is one, there is a chance of passing on the recessive gene, however.

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

Answer 4

In its most simple of forms: Yes, its the 'recessive' 'dominate' thing... (punnet squares and such).

But there is no gene that codes for "brown eyes" and gene that codes for "blue eyes", rather each of your grandparents had the ability in their DNA to have Blue eyes, and your uncles got lucky.

Not much, if anything, is ever controlled by a single gene (as the punnet squares say).  Rather, eye color is probably related to the amount a 'pigment' gene is expressed.  Say for brown eyes, its expressed 100 times in an iris cell, but for blue eyes its only expressed 30 times in an iris cell.  This isn't by any means how it actually works, but I think a good example of how genes work.

Answer 5

its called an affair.

when an adult bangs another adult besides his/her spouse.

haha, jkjk

Answer 6

ressive gene