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?

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

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

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

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?

A daughter will be color blind because the father is a carrier of the recessive allele.

A son will be color blind because the mother is a carrier of the recessive allele.

A daughter will not be color blind because the father is not a carrier of the recessive allele.

lena772 · Answer

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

the_fizicx99 · Answer

I'd say D. Makes more sense?

anonymous · Answer

@tHe_FiZiCx99
Can't it be either B or C?

the_fizicx99 · Answer

@AnlmEfReaK neither parents have color blindness, which leads me to think that the father's mother had color blindness. If it was C how does that explain why their first child has color blindness?

lena772 · Answer

It's not B..

the_fizicx99 · Answer

Yee Ik >.>