Question

the pedigree on the right shows the inheritance pattern for an x - linked recessive disorder. how many individuals are carriers of the disease but are not affected?
complete
what is the genotype of the male circled in pink?

done

Explanation:

For X - linked recessive disorders, males have one X and one Y chromosome. The affected male has the recessive allele on his X chromosome. The genotype of an affected male (for X - linked recessive) is \(X^{a}Y\) because he only needs one copy of the recessive allele (on the X chromosome) to be affected. Males cannot be carriers for X - linked recessive disorders as they have only one X chromosome. If they have the recessive allele (\(a\)), they are affected; if they have the dominant allele (\(A\)), they are normal.

Answer:

\(X^{a}Y\)