A man with normal vision marries a color-blind woman. Red-green color blindness is an X- linked recessive disorder. They have a daughter who has normal color vision. What is the probability that she is heterozygo

The probability is 100%.

Explanation: The chromosome X is related to gender. A man carries two different chromosomes (XY) and a woman carries two similar chromosomes (XX). The offspring of a couple will inherited:

In the question, the woman is color-blind, which means she carries the recessive alleles:

The man, on the other hand, is normal, so his X-linked genotype will be: .

Now, since they have a daughter, she inherited her double X from each of her parents, which means she inherited one from her mother and one from her father.

So, the daughter's genotype can only be heterozygotic   in other words, the probability is 100%.