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Cleft chin is an X-linked dominant trait. Assume that a man with a cleft chin marries a woman with a round chin.
-What percent of their male progeny will show the cleft chin trait?
A) 0
B) 25
C) 50
D) 75
E) 100

Question

Quizplus · Accepted Answer

Since cleft chin is an X-linked dominant trait, and the man has a cleft chin, he has the dominant allele on his X chromosome. The woman with a round chin has two recessive alleles. All male progeny inherit their X chromosome from their mother, who has the recessive allele, so 0% of the male progeny will have a cleft chin.

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