George is partially colorblind, his sister is not, but her sons are partially colorblind. These family traits are best described by which of the following statements?
A)Partial colorblindness occurs only in men.
B)The gene responsible for partial colorblindness has nothing to do with gender.
C)George's and his sister's eye color chromosomes are different.
D)Partial colorblindness is a sex-linked trait that affects mostly males.

Question

Quizplus · Accepted Answer

Partial colorblindness is a sex-linked trait that affects mostly males, meaning that it is carried on the X chromosome. Females have two X chromosomes, so they are less likely to be affected by the condition. However, if a female is a carrier of the gene, she can pass it on to her sons. This explains why George is partially colorblind, his sister is not (because she inherited a normal X chromosome from one of her parents), but her sons are partially colorblind because they inherited the X chromosome with the colorblindness gene from their mother.

George Is Partially Colorblind, His Sister Is Not, but Her