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Which of the following most appropriately describes haemophilia?
A
X-linked recessive gene disorder
B
Chromosomal disorder
C
Dominant gene disorder
D
Recessive gene disorder
Explanation
Haemophilia is X-linked recessive.
Detailed Solution
Haemophilia is an X-linked recessive disorder caused by mutations on the X chromosome. Males are affected because of their single X chromosome; daughters act as carriers.