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NEETZoologyPrinciples of Inheritance and Variation

What is the sex chromosome designation for the XO type of sex determination in grasshoppers?

Options

  1. AX-chromosome is absent in males
  2. BY-chromosome is present in both males and females
  3. CFemales have one X-chromosome, and males have none
  4. DMales have two X-chromosomes

Correct answer

A. X-chromosome is absent in males

Step-by-step solution

It was also observed that in a large number of insects the mechanism of sex determination is of the XO type, i.e., all eggs bear an additional X-chromosome besides the other chromosomes (autosomes). On the other hand, some of the sperms bear the X-chromosome whereas some do not. Eggs fertilized by sperm having an X-chromosome become females and those fertilized by sperm that do not have an X-chromosome become males. Do you think the number of chromosomes in the male and female are equal? Due to the involvement of t

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