Red-green colorblindness is a recessive X-linked trait.If a female is red-green colorblind,which of the following is TRUE?
A) Her mother must be colorblind.
B) Both her parents must be colorblind.
C) Both her parents are carriers of the recessive allele.
D) Her father must be colorblind.
E) Women cannot exhibit red-green colorblindness because they have two X chromosomes.

Question

Quizplus · Accepted Answer

If a female is red-green colorblind, it means that she has two copies of the X chromosome with the mutated gene. Since it is a recessive X-linked trait, her father must also have the mutated gene on his X chromosome, as males only have one X chromosome. Therefore, her father must be colorblind, and her mother could be a carrier or also be colorblind.

Red-Green Colorblindness Is a Recessive X-Linked Trait