which allele combination represents a female who is a carrier for an x - linked recessive disorder?\n$x^{r}x^…

which allele combination represents a female who is a carrier for an x - linked recessive disorder?\n$x^{r}x^{r}$\n$x^{r}x^{r}$\n$x^{r}y$\n$x^{r}y$

which allele combination represents a female who is a carrier for an x - linked recessive disorder?\n$x^{r}x^{r}$\n$x^{r}x^{r}$\n$x^{r}y$\n$x^{r}y$

Answer

Brief Explanations:

Females have two X - chromosomes (XX). A carrier for an X - linked recessive disorder has one normal allele and one recessive allele. The normal allele is represented as $X^R$ and the recessive as $X^r$. So the carrier genotype is $X^RX^r$. Males have XY chromosomes, so $X^RY$ and $X^rY$ are male genotypes and $X^rX^r$ is a homozygous recessive female (affected) genotype.

Answer:

A. $X^RX^r$