Question

if a man has an x - linked recessive disease, can his sons inherit that disease from him?
○ no, all his sons have one x chromosome.
○ yes, all his sons inherit their x chromosomes maternally.
○ no, all his sons inherit their x chromosomes maternally.
○ yes, all his sons inherit their y chromosomes maternally.
○ yes, all his sons have one x chromosome.

Explanation:

In humans, males have the sex chromosome composition \(XY\). Sons inherit the \(Y\) chromosome from their father and the \(X\) chromosome from their mother. Since the disease is \(X -\)linked, and the father's \(X -\)chromosome (with the recessive disease allele) is not passed to sons (sons get the \(Y\) from father), sons cannot inherit the \(X -\)linked recessive disease from their father.

Answer:

C. No, all his sons inherit their X chromosomes maternally.