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. Use a pedigree to trace family history.

Answer 1

Answer:

Given:

• Both set of Grandparents are Brown eyed(B)
• Paternal uncle of Mother is Blue eyed(b)
• Mother's siblings are 2 males-one Brown eyed(B) and the other Blue eyed(b)
• Father's siblings are 3-2 sisters (both blue eyed-b) and one brother( Brown eyed, B)
• Mother has Brown eyes (B)whereas Father has Blue eyes(b)
• Son is brown eyed(B) and he marries Blue eyed female(b)
• Grand daughter is blue eyed(b)