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

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~ in carrier individuals $\left(X{X}^c\right)$ does not cause the disease, thus the trait is recessive.