Red-green colorblindness is a commonly inherited form of colorblindness; the gene involved is transmitted on the X chromosome in a recessive manner. If a male inherits an affected X chromosome, he is necessarily colorblind (genotype X-Y ). However, a female can only be colorblind if she inherits two defective copies (genotype X-X-); heterozygous females are not colorblind. Suppose that a couple consists of a genotype X+Y male and a genotype  female.

(a) What is the probability of the couple producing a colorblind male?

(b) True or false: Among the couple’s offspring, colorblindness and female sex are mutually exclusive events.

Transcribed Image Text:

X+X-