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NEETZoologyPrinciples of Inheritance and Variation

A male grasshopper has a total of 23 chromosomes in its somatic cells. What is the total number of chromosomes in the somatic cells of a female grasshopper of the same species, and what term describes her gamete production with respect to sex chromosomes?

Options

  1. A22 and heterogametic
  2. B24 and heterogametic
  3. C23 and homogametic
  4. D24 and homogametic

Correct answer

D. 24 and homogametic

Step-by-step solution

Grasshoppers exhibit the XX-XO type of sex determination. Males have only one X chromosome besides the autosomes (AA + XO). If a male has 23 chromosomes, the autosome number is 22 (22 + 1 = 23). Females have a pair of X chromosomes besides the autosomes (AA + XX). Therefore, the female will have 22 + 2 = 24 chromosomes. Since females produce only one type of egg (all containing an X chromosome), they are termed homogametic. Answer: 24 and homogametic

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