The pedigree on the right shows the inheritance pattern for an X-linked recessive disorder. The mother of the individuals circled in pink is not shown on the pedigree. Based on the phenotypes of these individuals and their father, what are the possible genotypes of their mother? Check all of the boxes that apply

The right answers are: XAXA and XAXa

Explanation:

A genetic disease is caused by an X-linked recessive inheritance when:

1. the gene present on the x linked chromosome, involved in the mutation.

2. The presence of both mutant alleles is necessary for the disease to be expressed in a female.

As per the image, the mother has always transferred a healthy allele (XA) so the answers are the genotypes carrying this allele.

Thus, the right answers are: XAXA and XAXa

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