Multiple choice

Haemophilia is more commonly seen in human males than in human females because

  1. this disease is due to a Y-linked recessive mutation.

  2. this disease is due to an X-linked recessive mutation.

  3. this disease is due to an X-linked dominant mutation.

  4. a greater proportion of girls die in infancy.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 Haemophilia is more commonly seen in human males than in human females because this disease is due to an X-linked recessive mutation.X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be expressed in males (who are necessarily hemizygous for the gene mutation because they have one X and one Y chromosome) and in females who are homozygous for the gene mutation.

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