Suppose that extra fingers and toes are caused by a recessive trait, but it appears in only 60% of homozygous recessive individuals. Two heterozygotes conceive a child. What is the probability that this child will have extra fingers and toes?
A) 0.05
B) 0.10
C) 0.15
D) 0.25
E) 0.33

Question

Quizplus · Accepted Answer

The probability of the child being homozygous recessive is 0.25 (from a Punnett square). Given that only 60% of homozygous recessive individuals express the trait, the probability is 0.25 * 0.60 = 0.15.

Suppose That Extra Fingers and Toes Are Caused by a Recessive