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NEET BIOLOGYMedium

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A): A father will never pass the gene for haemophilia to his sons. Reason (R): Haemophilia is sex-linked (X-linked recessive trait). In the light of the above statements, choose the correct answer from the options given below:

A

(A) is True but (R) is False.

B

(A) is False but (R) is True.

C

Both (A) and (R) are True and (R) is the correct explanation of (A).

D

Both (A) and (R) are True but (R) is not the correct explanation of (A).

Step-by-Step Solution

:

  • Reason (R) is True: Haemophilia is a sex-linked recessive disease, specifically linked to the X-chromosome .
  • Assertion (A) is True: In human sex determination, males have one X and one Y chromosome (XY). A father transmits his Y chromosome to his sons and his X chromosome to his daughters .
  • Relationship: Since the gene for haemophilia is located on the X chromosome (as stated in the Reason), and a father never passes his X chromosome to his sons, he can never pass the gene for haemophilia to them. Thus, the reason correctly explains the assertion.
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