Question

X${}^h$ is the chromosome with gene for haemophilia and X is the chromosome with normal gene. Which of the following individuals will act as carrier for haemophilia?

• A. X${}^h$Y
• B. X Y
• C. X X${}^h$
• D. None of the above

Answer 1

Answer: (C)

X X${}^h$

Carrier females only exist, because they have two X chromosomes which can carry genes, called as homozygous. This is not possible in men, because men cannot carry genes on Y chromosome. Thus, the carrier female will have genotype of X${}^h$X.

So, the correct answer is option C.