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NEET 2022 · BiologyPrevious Year Question

XO type of sex determination can be found in

Answer: (C) Grasshoppers. Answer: (C) Grasshoppers Solution: In the XO type of sex determination the male has only one X chromosome (no Y) besides the autosomes, while the female has a pair of X chromosomes.

  1. A.Drosophila
  2. B.Birds
  3. C.Grasshoppers✓
  4. D.Monkeys

Correct Answer

(C) Grasshoppers

Solution & Explanation

Answer: (C) Grasshoppers Solution: In the XO type of sex determination the male has only one X chromosome (no Y) besides the autosomes, while the female has a pair of X chromosomes. NCERT cites grasshopper as the example of this XO mechanism. Drosophila and monkeys are XY type, and birds are ZW/ZZ type, so they are excluded. 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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