Question

Inheritance of which of the following traits is shown in the given cross ?

• A. $X$-linked dominant trait
• B. $X$-linked recessive trait
• C. Autosomal recessive trait
• D. Autosomal dominant trait

Answer 1

Answer: (B)

$X$-linked recessive trait

Answer 2

In the given cross, passing of disease is from carrier female to male progeny (criss-cross inheritance). Any trait that shows criss-cross inheritance is located on the sex chromosome. Presence of a single recessive gene i.e. $X^c$ in carrier individuals $(XXC)$ does not cause the disease, thus the trait is recessive.