NEET 1990 · Class 12

Principles of Inheritance and Variation

Haemophilia is more common in males because it is a

  1. (A)recessive character carried by Y-chromosome
  2. (B)dominant character carried by Y-chromosome
  3. (C)dominant trait carried by X-chromosome
  4. (D)recessive trait carried by X-chromosome

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', which directly identifies haemophilia as both X-linked (sex-linked) and recessive, matching option D.

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