NEET 2026 (cancelled) · Question 177 · Class 12

Principles of Inheritance and Variation

In a population of a grasshopper species, the chromosome number of some members is 23 and some other members possess 24 chromosomes. The 23 and 24 chromosome-bearing members in this species are _______.

  1. (A)females and males, respectively
  2. (B)males and females, respectively
  3. (C)all males
  4. (D)all females

The NCERT line that answers it

Verbatim line

Grasshopper is an example of XO type of sex determination in which the males have only one X-chromosome besides the autosomes, whereas females have a pair of X-chromosomes.

Chapter
Principles of Inheritance and Variation
Section
4.6 SEX DETERMINATION
Page
19
Words matched
27 of 28

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 in grasshoppers (XO type), males have one X-chromosome and females have a pair, which directly implies males have 23 chromosomes (one X) and females have 24 (two X), matching option B.

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Question text is reproduced from the published NEET 2026 (cancelled) 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.