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NEETZoologyPrinciples of Inheritance and Variation

Select the incorrect statement for the given figure.

Options

  1. AIn Drosophila the males have one X and one Y chromosome, whereas females have a pair of X-chromosomes besides
  2. BIn insects eggs bear an additional X-chromosome besides the other chromosomes and all of the sperms bear the X
  3. CIn cases where males produce two different types of gametes, (a) either with or without X-chromosome or (b) so
  4. DIn human beings and in Drosophila the males have one X and one Y chromosome, whereas females have a pair of X-

Correct answer

B. In insects eggs bear an additional X-chromosome besides the other chromosomes and all of the sperms bear the X

Step-by-step solution

Further investigations by other scientists led to the conclusion that the ‘X body’ of Henking was in fact a chromosome and that is why it was given the name X-chromosome. 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. In human beings and in Drosophila the males have one X and one Y chro

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