Question

Regarding the assertion and reason; choose the correct option.

Assertion [A]: A genetic disease that affects only one parent can have 50% chance of affecting the child.

Reason [R]: An autosomal dominant defective allele can cause a disease even in heterozygous condition.

• A. Assertion [A] is True and Reason [R] is False.
• B. Reason [R] is True and Assertion [A] is False.
• C. Assertion [A] is True and Reason [R] is True and is a correct explanation for [A].
• D. Assertion [A] is True and Reason [R] is True but is an incorrect explanation to [A].

Answer 1

The correct option is C

Assertion [A] is True and Reason [R] is True and is a correct explanation for [A].

When a disease is autosomal dominant in nature, one copy of the defective allele is enough to cause the disease in the individual. Therefore, if a person has an autosomal dominant disease, there is 50% chance that it will affect the offspring.