The allele combination XRXr represents a female who is a carrier for an X-linked recessive disorder.
X-linked recessive inheritance
Females usually inherit two chromosomes X, while men inherit only one chromosome X (and one chromosome Y).
- The inheritance of the chromosome X in females resembles mendelian inheritance because females have two X chromosomes.
- In this case, females having the genotype XRXr are carriers because lowercase letters denote the presence of the recessive allele.
In conclusion, the allele combination XRXr represents a female who is a carrier for an X-linked recessive disorder.
Learn more about inheritance linked to the chromosome X here:
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