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NEETZoologyPrinciples of Inheritance and Variation

What is aneuploidy?

Options

  1. AAn increase in the number of chromosome sets
  2. BThe presence of an extra copy of a single chromosome
  3. CA defect in a single gene
  4. DA type of genetic mutation affecting proteins

Correct answer

B. The presence of an extra copy of a single chromosome

Step-by-step solution

The chromosomal disorders on the other hand are caused due to absence or excess or abnormal arrangement of one or more chromosomes. Failure of segregation of chromatids during cell division cycle results in the gain or loss of a chromosome(s), called aneuploidy . For example, Down’s syndrome results in the gain of extra copy of chromosome 21. Similarly, Turner’s syndrome results due to loss of an X chromosome in human females. Failure of cytokinesis after telophase stage of cell division results in an increase in a

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