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NEET2011ZoologyPrinciples of Inheritance and VariationActual

Which of the following is correct?

Options

  1. AHenking discovered the small Y-chromosome.
  2. BDrosophila also shows X X-X Y sex determination like human.
  3. CBirds have Z Z-Z W sex determination, where females are Z Z & males are Z W .
  4. DGrasshoppers show X X-X Y sex determination.

Correct answer

B. Drosophila also shows X X-X Y sex determination like human.

Step-by-step solution

Hermann Henking discovered the X chromosome while studying insects in the early 1890s. The sex chromosomes in birds are opposite of that in humans. Human males are heterogametic (X Y ), females are homogametic (X X) , in birds males are homogametic (ZZ) and females are heterogametic ( ZW ) . The " W " is the sex determining chromosome just as the Y in humans. A bird with a W is always a female. In grasshoppers, there is no Y chromosome, so a grasshopper with one X chromosome (symbolized as XO ) is normally a male,

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