A brown-eyed couple already has a child with blue eyes. What is the probability that their next child will have blue eyes, assuming that the brown eye allele is dominant and the blue eye allele is recessive?
A) 0
B) 1/4
C) 1/2
D) 3/4
E) 1

Question

Quizplus · Accepted Answer

If both parents are heterozygous (Bb) for brown eyes, there's a 1/4 chance for a child to inherit two recessive blue eye alleles (bb).

A Brown-Eyed Couple Already Has a Child with Blue Eyes