The allele for brown eyes dominates the allele for blue eyes.?

Question

A woman with brown eyes carries the blue-eyed allele. If she has children with a blue-eyed man, what is the probability that their offspring will have blue eyes?


1/4

1/2

3/4

1

Answer 1

Eye color is not actually this simple, but this problem means that the woman is Bb and the man is bb. The child has a 1/2 chance of having bb.

1/2

Answer 2

1/2. She has an equal chance of donating a brown-eye or a blue-eye allele to the child. If her husband has blue eyes, he must have two blue-eye alleles, so he has to pass one to the child. Therefore the child has an equal chance of being heterozygous, or having one allele for each eye color, in which case he'll have brown eyes, or homozygous, with two blue-eye alleles, in which case he'll have blue eyes.

Answer 3

stump your teacher with the fact that eye color is a multiple allele. like someone else mentioned, eye color is much more complicated than just recessed or dominant.

1/2 by the simple dom/recessant gene matrix. but this is not the most accurate answer. google allele or wikipedia it.