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 ______.
- A.females and males, respectively
- B.all males
- C.males and females, respectively✓
- 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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