Question

A man and his wife are having trouble having a baby. Using modern technologies, the woman's eggs are removed, fertilized with her husband's sperm, and implanted into her uterus. The procedure is successful, and the woman gives birth to a healthy baby boy. After a while, though, they discover that their son is colorblind. The woman claims that the child can't be theirs since neither parent is colorblind, although one grandparent (the woman's father) is also colorblind. As a genetic counselor, you would explain to the parents that _________.
a. the eggs must have been accidentally switched, since males inherit sex-linked traits only from their fathers
b. colorblindness often appears randomly, even if neither parent is colorblind
c. since colorblindness is sex-linked, a son can inherit colorblindness if his mother has the recessive colorblindness allele
d. the baby's father must have a recessive allele for colorblindness

Answer 1

Answer: Option C

Explanation:

Color blindness is a common hereditary condition which means it usually passes from parents. Red green color blindness is passed on from the mother to the son.

The chromosome number 23 is the sex chromosome also responsible for colorblindness. As it is sex linked the son can receive the recessive allele from the mother.

The mother of the child had a recessive allele which she transferred into her son. As it is sex inherited disease the son is affected by gene carried from mother.