Question

If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is

• A. Autosomal dominant
• B. Autosomal recessive
• C. Sex-linked dominant
• D. Sex-linked recessive

Answer 1

The correct option is D Sex-linked recessive

The sex linked recessive disease shows its transmission from unaffected carrier female to some of the male progeny e.g., haemophilia. The heterozyous female (carrier) of haemophilia may transmit the disease to sons. The possibility of a female becoming a haemophilic is extremely rare because mother of such a female has to be at least carrier and the father should be haemophilic.

So, the correct answer is 'Sex-linked recessive'.