Question

Which of the following statement is true for X-linked recessive inheritance?

• A. All sons of a normal mother should show the trait.
• B. All sons of an affected mother should show the trait.
• C. Many more females than males should exhibit the trait.
• D. All daughters of a normal mother should show the trait.

Hint:

Understand the inheritance pattern of X-linked recessive traits and how it differs between males and females.

Answer 1

The Correct Option is B

In X-linked recessive inheritance, an affected mother has two defective X chromosomes and will pass one defective X chromosome to all her sons. Since males inherit only one X chromosome, they will always express the trait if they inherit the defective gene. Females are less frequently affected because they require two copies of the defective gene to show the trait.