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NEET 2026 (Phase 1) · BiologyPrevious Year Question

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 ______.

Answer: (C) males and females, respectively. Answer: (C) males and females, respectively Solution: Grasshopper shows XO type sex determination: males have only one X chromosome besides the autosomes (an odd total, 23), whereas females have a pair of X chromosomes (an even total, 24).

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

Correct Answer

(C) males and females, respectively

Solution & Explanation

Answer: (C) males and females, respectively Solution: Grasshopper shows XO type sex determination: males have only one X chromosome besides the autosomes (an odd total, 23), whereas females have a pair of X chromosomes (an even total, 24). Therefore the members with 23 chromosomes are males and those with 24 chromosomes are females. NCERT Reference: NCERT Class XII, Ch 4, p.70, lines 27-31: "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."

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