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Question

Which of the following is associated with Y chromosome?
  1. Haemophilia
  2. Hypertrichosis of ears
  3. Colour blindness
  4. Night blindness

A
Colour blindness
B
Night blindness
C
Haemophilia
D
Hypertrichosis of ears
Solution
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Hypertrichosis of the ear is the abnormal growth of hair on the external ear. It is a Y-linked trait. The hairy-eared males carried Y chromosomes from many haplogroups of the Y-phylogeny. According to a hypothesis of Y-linkage, it would require multiple independent mutations within a single population. Thus, option C is correct.

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