Which of these illustrates the presence of a recessive sex-linked allele?

Question

Quizplus · Accepted Answer

The inheritance of red/green color blindness is a sex-linked trait that is carried on the X chromosome. Since the mother has normal color vision, she must carry one normal X chromosome and one X chromosome with the recessive allele for color blindness. Her son inherits the affected X chromosome from her, resulting in his color blindness. This pattern of inheritance is consistent with a recessive sex-linked allele.

Which of These Illustrates the Presence of a Recessive Sex-Linked