Question

final exam
why are males more likely to have colorblindness?
males inherit two y chromosomes with the colorblind gene.
males inherit one x chromosome with the colorblind gene.
males inherit a y chromosome without the colorblind gene.

Explanation:

Color - blindness is an X - linked recessive trait. Males have one X and one Y chromosome. If they inherit an X chromosome with the color - blind gene, they will be color - blind as they don't have a second X chromosome to mask the recessive gene. Females have two X chromosomes, so they need to inherit two copies of the color - blind gene to be color - blind, making males more likely to be affected.

Answer:

Males inherit one X chromosome with the color - blind gene.