Since red-green color weakness is recessive and sex-linked, the incidence of this color weakness is likely to be greatest among
A)infants rather than adults.
B)girls rather than boys.
C)men rather than women.
D)nearsighted rather than farsighted females.

Question

Quizplus · Accepted Answer

Since red-green color weakness is a sex-linked trait located on the X chromosome, men are more likely to be affected than women. This is because women have two X chromosomes and would need both copies to carry the trait in order to be affected, whereas men only have one X chromosome and would only need the trait to be present on that single chromosome to be affected. Therefore, the incidence of red-green color weakness is greatest among men rather than women, infants or girls. The choice D is not relevant and does not affect the incidence of color weakness.

Since Red-Green Color Weakness Is Recessive and Sex-Linked, the Incidence