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NEETZoologyPrinciples of Inheritance and Variation

Read the following statements carefully: (A) Aneuploidy results from the failure of cytokinesis after telophase of cell division. (B) Polyploidy is an increase in a whole set of chromosomes and is often seen in plants. (C) Down's syndrome is an example of aneuploidy caused by the gain of a whole set of chromosomes. (D) Turner's syndrome is caused by the loss of an X chromosome, representing a monosomic condition. How

Options

  1. ATwo
  2. BOne
  3. CThree
  4. DFour

Correct answer

A. Two

Step-by-step solution

Statement (A) is incorrect. Aneuploidy results from the failure of segregation of chromatids during the cell division cycle, whereas the failure of cytokinesis after telophase leads to polyploidy. Statement (B) is correct. Polyploidy involves an increase in a whole set of chromosomes and is frequently observed in plants. Statement (C) is incorrect. Down's syndrome is an example of aneuploidy, but it is caused by the gain of a single chromosome (trisomy 21), not a whole set of chromosomes. Statement (D) is correct.

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