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NEETZoologyPrinciples of Inheritance and Variation

A female grasshopper has 24 chromosomes in her somatic cells. What will be the exact number of chromosomes present in the two types of sperms produced by the male of the same species?

Options

  1. A12 and 12
  2. B12 and 11
  3. C11 and 10
  4. D24 and 23

Correct answer

B. 12 and 11

Step-by-step solution

In grasshoppers, the sex determination mechanism is of the XX-XO type. The female is homogametic (XX) and the male is heterogametic (XO). Given that the female somatic cell has 24 chromosomes, its chromosomal makeup is 22 autosomes + XX. The male of the same species will have 22 autosomes + XO, making a total of 23 chromosomes in its somatic cells. During spermatogenesis (meiosis), the homologous autosomes segregate equally, so every sperm receives 11 autosomes. The single X chromosome goes to 50% of the sperms, wh

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