Question

Brown eyes in humans are dominant to blue eyes. A brown-eyed man, whose mother was blue-eyed, marries a brown-eyed woman whose father had blue eyes. What is the probability that this couple will have a blue-eyed child?

Answer 1

the man and woman are both hybrid brown with a blue recessive

do a Punnett Square with Bb and Bb

Answer 2

Probability is 1/4 or 25%