Question

The female children of haemophilic father and carrier mother will be

• A. All haemophilic.
• B. Half haemophilic, half carrier.
• C. All normal.
• D. All carrier.

Answer 1

The correct option is B Half haemophilic, half carrier.

When a father who has hemophilia and a mother who is a carrier create a child, there are four possible outcomes for each pregnancy. This depends on which X or Y chromosome the children receive from the father and which of the two X chromosomes the children receive from the mother. As illustrated above they can have a son without hemophilia, a daughter who has hemophilia, a son with hemophilia or a daughter who is a carrier. With each pregnancy, there is an equal chance of each of these outcomes.

Therefore, the correct answer is option B.