AP BIOLOGY

Detailed explanation-1: -It’s estimated that up to eight per cent of boys have some degree of colour blindness (also known as colour vision deficiency or CVD), whereas less than one per cent of girls do. That’s about one in 12 boys, and around one in 200 girls. What causes colour blindness?

Detailed explanation-2: -Most commonly, color blindness is inherited as a recessive trait on the X chromosome. This is known in genetics as X-linked recessive inheritance. As a result, the condition tends to affect males more often than females (8% male, 0.5% female).

Detailed explanation-3: -If it is only present on one, the female will only be a carrier and likely not express the trait. Since males only have on X chromosome, if it is present, it will be expressed. So if a female is color blind, her genotype would be XbXb, and a man with normal vision would have the genotype XBY.