In animals, the inability to make the pigment melanin results in albinism, a recessive condition. Two unaffected parents, who have decided to have three children, have a first child that has albinism (genotype aa). What is the probability that the second and third children will also have albinism?
A) 1/4
B) 1/2
C) 1/16
D) 9/16
E) 1 (100%)

Question

Quizplus · Accepted Answer

Since albinism is a recessive condition, both parents must be carriers (Aa). The probability of each child being albino (aa) is 1/4. The probability that both the second and third children are albino is 1/4 * 1/4 = 1/16.

In Animals, the Inability to Make the Pigment Melanin Results