Red-green color blindness is a sex-linked recessive trait in humans.The normal,dominant allele is symbolized with X^N,and the recessive allele is symbolized with Xⁿ.Two people with normal color vision have a color-blind son.What are the genotypes of these parents? A)X^NXⁿ and XⁿY B)XⁿXⁿand X^NY C)X^NX^Nand XⁿY D)X^NX^Nand X^NY E)X^NXⁿand X^NY

Question

Quizplus · Accepted Answer

The mother must be a carrier (X^NXⁿ) to pass the recessive allele to the son, and the father must have normal vision (X^NY) since he cannot pass an X chromosome to his son.

Red-Green Color Blindness Is a Sex-Linked Recessive Trait in Humans