NEET 2012 · Class 12

Principles of Inheritance and Variation

[DIAGRAM: A circular inheritance pattern diagram showing mother-to-son and father-to-daughter transmission, indicating an X-linked trait.] 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' that shows 'transmission from unaffected carrier female to some of the male progeny', which directly matches the X-linked inheritance pattern described in the question.

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