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NEETZoologyPrinciples of Inheritance and Variation

What are autosomes?

Options

  1. ASex chromosomes
  2. BThe first 22 pairs of chromosomes in humans
  3. CThe last pair of chromosomes in humans
  4. DAbnormal chromosomes

Correct answer

B. The first 22 pairs of chromosomes in humans

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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