Question

A woman with brown eyes, which has two brothers, marries a man with brown eyes, which has a brother and two sisters, and produces a boy with brown eyes.  When their son marries a woman with blue eyes, they have a girl with blue eyes.  All of the boy's aunts and uncles have brown eyes, as do his grandparents.  However, his mother, the little girl's grandmother, has an uncle with blue eyes.  Trace the family history of eye color and determine how the little girl could have blue eyes.

Answer 1

Answer:

A. The man's genotype is Bb. Phenotypes of the offsprings:- heterozygous brown-eyed- homozygous blue eyedGenotypes of the offsprings:- Bb- bbb. The blue is recessive, so the woman's genotype is bb. It is impossible for her to have B because it is dominant over b.c. The woman can only produce bb or blue-eyed.d. The man's genotype is Bb. It is impossible for him to produce an offspring with blue-eyes if his genotype is BB.e. The man can produce Bb or brown-eyed and bb or blue-eyed.

Explanation: