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. xaxa xaxa xaxa

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.

answer: a. a gene that causes a specific trait.