The right answers are : XAXA and XAXa.
A genetic disease is referred to as X-linked recessive inheritance when:
* the gene involved in the mutation is on the sex chromosome X
* the mutation is recessive, a man carrying the mutant allele will be ill, because hemizygote for the X chromosome. The presence of both mutant alleles is necessary for the disease to be expressed in a girl.
According to the image, the mother has always transmitted a healthy allele (XA) so the answers are the genotypes carrying this allele.
