NEET 2005 · Class 12

Principles of Inheritance and Variation

Haemophilia is more commonly seen in human males than in human females because (2005)

  1. (A)a greater proportion of girls die in infancy
  2. (B)this disease is due to a Y-linked recessive mutation
  3. (C)this disease is due to an X-linked recessive mutation
  4. (D)this disease is due to an X-linked dominant mutation

The NCERT line that answers it

Verbatim line

This sex linked recessive disease, which shows its transmission from unaffected carrier female to some of the male progeny has been widely studied.

Chapter
Principles of Inheritance and Variation
Section
4.8.2 Mendelian Disorders

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'This sex linked recessive disease' and describes transmission from carrier female to male progeny, which conclusively identifies haemophilia as an X-linked recessive disorder, matching option C.

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