Question

Of a normal couple, half the sons are haemophilic while half the daughters are carriers. The gene is located on

• A. X-chromosome of father
• B. Y-chromosome of father
• C. one X-chromosome of mother
• D. both the X-chromosomes of mother

Answer 1

The correct option is C

one X-chromosome of mother

Of a normal couple, half the sons are haemophilic while half the daughters are carries. The gene is located on one X-chromosomes of mother. Cross between a haemophilic carrier female X^hX and normal male would yield 50% of the sons being haemophilic and 50% of the daughter are carriers.