NEET 2012 · Class 12

Principles of Inheritance and Variation

[DIAGRAM: A circular pedigree-style diagram divided into four sectors labeled Female mother, Male father, Daughter, and Son, indicating a sex-linked inheritance pattern where the trait is transmitted from mother to son.] Represented below is the inheritance pattern of a certain type of trait in humans. Which one of the following conditions could be an example of this pattern?

  1. (A)Phenylketonuria
  2. (B)Sickle cell anaemia
  3. (C)Haemophilia
  4. (D)Thalassemia

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
Page
23
Words matched
35 of 35

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 that haemophilia is a sex-linked recessive disease transmitted from unaffected carrier female to male progeny, which directly matches the inheritance pattern described in the question.

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