Genetics - eye color?

In sheep, eye color is controlled by a single gene with two alleles. When a homozygous brown-eyed sheep is crossed with a homozygous green-eyed sheep, blue-eyed offspring are produced. If the blue-eyed sheep are mated with each other, what percent of their offspring will most likely have brown eyes? Please explain.Genetics - eye color?
25%


brown eyes: BB


green eyes: bb


blue eyes: Bb


if you cross Bb with Bb:


25% brown


25% green


50% blueGenetics - eye color?
Gary is incorrect in the terms of this question. Blue eyes are a recessive trait in humans, but the way the question is worded, the blue eyes are not recessive in sheep. In this case there would not be a dominate or recessive gene, as a combination results in a different trait, making neither dominant. I often saw this example used with red and white flowers making pink flowers. I think this is called co-dominance.
0% will have brown eyes.





A sheep with brown eyes carries two traits; a dominant and a reccesive trait. These can be represented with the symbols B for brown eye color, and b for blue eye color. Now a parent can only pass on one of these. This is more easily shown with a punnett square. But either way, every sheep will have two traits that manipulate eye color. The combination of a Bb (blue from one parent, brown for the other parent) would result in a brown (B) eye. This is because blue eye color is recessive amongst sheep (this also holds true for humans). The only way a sheep could have blue eyes would be if both parents carried the recessive blue eyed trait and they both passed it on. The offspring would have the bb combination as opposed to the Bb combination that the parents had, meaning they will always have a blue-eyed baby if they mate with a sheep that also has blue eyes.








Answer in short: 0% brown-eyed offspring will result from the mating of two blue-eyed sheep.