Question

Color blindness is a sex-linked recessive trait. A mother with normal color vision and a color blind father have a color blind daughter. Which statement is true about the offspring? A) All of their daughters must be color blind. B) Some of their sons can have normal color vision. C) All of their sons will carry a gene for color blindness. D) None of their daughters will carry a gene for color blindness.

Answer 1

Im going to say B because process of elimination

The mom normal vision so  their future daughters may end up with the non color blind gene, again the future sons may end up without the gene since the mother does not have it and only has one on one x and d is just false because they already had a daughter with it.

Answer 2

Answer:

B) Some of their sons can have normal color vision.

Explanation:

Some of their sons can have normal color vision. The normal vision mother must be a carrier and have one allele for colorblindness. The daughters would definitely receive the colorblind allele from their father, so there is no "might" about it. The daughters have a 50% chance of receiving the colorblind allele from their mother. The sons also have a 50% chance of receiving the colorblind allele from their mother. Since this allele is sex-linked and X-linked, the sons cannot receive the allele from their father.