Why are males more likely than females to have a deficiency in red-green color vision?

Question

Quizplus · Accepted Answer

Males are more likely to have a deficiency in red-green color vision because the genes responsible for this condition are located on the X chromosome. Males have only one X chromosome (XY), while females have two (XX). If a male inherits an X chromosome with the mutation, he will express the condition, as there is no corresponding gene on the Y chromosome to counteract it. Females, on the other hand, would need to inherit the mutation on both of their X chromosomes to express the condition, making it less common among females.

Why Are Males More Likely Than Females to Have a Deficiency