Question

use the pedigree on the right to determine the genotype of ryan. x^{r}x^{r} x^{r}y x^{r}x xy

Explanation:

Step1: Analyze the sex - linked inheritance pattern

Since Ryan is male, his genotype will have one X and one Y chromosome.

Step2: Determine the X - chromosome allele

Looking at the pedigree, Tim has \(X^{r}Y\) (affected male) and Carol has \(X^{R}X^{r}\). For a male child (Ryan), he gets the Y chromosome from his father (Tim) and the X chromosome from his mother (Carol). Since Carol has \(X^{R}X^{r}\), and Ryan is unaffected (assuming \(X^{R}\) is the normal allele), Ryan gets the \(X^{R}\) from Carol.

Answer:

\(X^{R}Y\)