NEET 2008 · Class 12

Principles of Inheritance and Variation

Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?

  1. (A)Erythroblastosis foetalis - X-linked
  2. (B)Down's syndrome - 44 autosomes + XO
  3. (C)Klinefelter's syndrome - 44 autosomes + XXY
  4. (D)Colour blindness - Y-linked

The NCERT line that answers it

Verbatim line

**Klinefelter's Syndrome :** This genetic disorder is also caused due to the presence of an additional copy of X-chromosome resulting into a karyotype of 47, XXY.

Chapter
Principles of Inheritance and Variation
Section
4.8.3 Chromosomal Disorders
Page
25
Words matched
16 of 25

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 'karyotype of 47, XXY', which directly matches option C's description of '44 autosomes + XXY' (since 44 autosomes + XXY = 47 total chromosomes).

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Question text is reproduced from the published NEET 2008 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.