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NEET2026BiologyChapterActual

In a certain insect species exhibiting the XX-XO type of sex determination, the somatic cells of a female contain a total of 18 chromosomes. Which of the following represents the correct chromosome composition of the sperms produced by a male of this species?

Options

  1. A50 % sperms with 9 autosomes + X and 50 % sperms with 9 autosomes + 0
  2. B50 % sperms with 8 autosomes + X and 50 % sperms with 8 autosomes + 0
  3. C100 % sperms with 8 autosomes + X
  4. D50 % sperms with 8 autosomes + X and 50 % sperms with 8 autosomes + Y

Correct answer

B. 50 % sperms with 8 autosomes + X and 50 % sperms with 8 autosomes + 0

Step-by-step solution

In XX-XO type of sex determination, females are XX and males are XO. The somatic cells of a female contain 18 chromosomes, which can be represented as 16 autosomes + XX . The somatic cells of a male will contain 16 autosomes + XO , totaling 17 chromosomes. During spermatogenesis, meiosis reduces the chromosome number by half. The 16 autosomes segregate equally, so each sperm receives 8 autosomes. The single X chromosome goes to half of the sperms, while the other half receives no sex chromosome. Therefore, the male

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