Question

A man and woman have a son who is color blind, a recessive sex-linked trait carried on the X-chromosome, but neither parent is color blind. The woman is now pregnant with their second child. Which of the following statements is true about the second child?

Answer 1

A: A daughter will be color blind because the father is a carrier of the recessive allele.

B: A son will be color blind because the mother is a carrier of the recessive allele.

C: A daughter will not be color blind because the father is not a carrier of the recessive allele.

D: A son will be color blind because the father’s mother must have been a carrier for recessive allele.