Question

Colorblindness is a recessive X-linked disorder. Which of the following correctly shows the genotype of a female who is colorblind?
Responses

XCXC
X C X C

XCXc
X C X c

XcXc
X c X c

XcY

Answer 1

Colorblindness is a recessive X-linked disorder, which means that a female must inherit two copies of the recessive allele (one from each parent) to be colorblind. The allele for colorblindness is often represented by \( X^c \) (the recessive allele), while the normal vision allele is represented by \( X^C \) (the dominant allele).

Given that a female who is colorblind has the genotype with two recessive alleles, the correct genotype for a colorblind female is:

**\( X^c X^c \)**

The other options represent different genotypes that do not correspond to a colorblind female. Therefore, the correct answer is:

**\( XcXc \)** (with the "c" denoting the recessive allele for colorblindness).