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NEETZoologyPrinciples of Inheritance and Variation

What is the size comparison between the X-chromosome and Y-chromosome in XY sex determination?

Options

  1. AX-chromosome is smaller than the Y-chromosome
  2. BY-chromosome is smaller than the X-chromosome
  3. CX-chromosome and Y-chromosome are of equal size
  4. DX-chromosome is absent in males

Correct answer

B. Y-chromosome is smaller than the X-chromosome

Step-by-step solution

These observations led to the investigation of a number of species to understand the mechanism of sex determination. In a number of other insects and mammals including man, XY type of sex determination is seen where both male and female have the same number of chromosomes. Among the males an X-chromosome is present but its counterpart is distinctly smaller and called the Y-chromosome . Females, however, have a pair of X chromosomes. Both males and females bear the same number of autosomes. Hence, the males have aut

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