Problem:

Sex linked inheritance:

Assume N = normal vision gene; n = colorblindness gene.

A woman who is a carrier for colorblindness has children with a man with normal vision.

Question: Which of the following is true for their genotype?

a. the mother is Xn Xn and the father is XN Y.

b. the mother is XN XN and the father is Xn Y.

c. the mother is XN Xn and the father is XN Y.

d. the mother is XN Xn and the father is XN YN.

Please select correct answer and also provide explaination.