in the pedigree that is shown, which represents irenes allele combination?\no $x^{h}x^{h}$\no…

in the pedigree that is shown, which represents irenes allele combination?\no $x^{h}x^{h}$\no $x^{h}x^{h}$\no $x^{h}x^{h}$\no $x^{h}y$

in the pedigree that is shown, which represents irenes allele combination?\no $x^{h}x^{h}$\no $x^{h}x^{h}$\no $x^{h}x^{h}$\no $x^{h}y$

Answer

Answer:

C. $X^{H}X^{H}$

Explanation:

Step1: Analyze the pedigree

The pedigree shows a sex - linked trait. Males have XY chromosomes and females have XX chromosomes. Irene is female (represented by a circle), so her genotype will be XX, eliminating option D ($X^{h}Y$) which is for a male.

Step2: Consider Marie's genotype

Marie has the genotype $X^{H}X^{h}$. Her father has $X^{H}Y$. Since fathers pass their X - chromosome to their daughters, Marie must have received $X^{H}$ from her father.

Step3: Determine Irene's genotype

Irene is not affected (represented by an unshaded circle). Since her mother Marie has $X^{H}X^{h}$ and her father (not shown with a specific allele for this trait in relation to this question) and considering she is not affected, the most likely genotype for Irene is $X^{H}X^{H}$ as she has received at least one $X^{H}$ from her father and could have received another $X^{H}$ from her mother.