Question

marcus says to you, \ive never met a color-blind woman, but i know a ton of guys who are. whats up with that?\ how could you explain this phenomenon to marcus? color-blindness is a manly mans condition. color-blindness is an x - linked condition that affects more men because the sex chromosomes for men are xx color - blindness affects fewer women because of their xy genotype thus making them less likely to inherit the condition color - blindness is an x - linked condition that is expressed most commonly in men since they have only one x chromosome and women have two x chromosomes

Explanation:

Color - blindness is an X - linked recessive disorder. Men have the XY genotype. If the X chromosome has the color - blindness allele, since there is no second X to mask it (as in women with XX), the trait is expressed. Women need two copies of the recessive allele (one on each X) to be color - blind.

Answer:

Color - blindness is an X - linked condition that is expressed most commonly in men since they have only one X chromosome and women have two X chromosomes.