How many pairs of autosomes does a normal human have?

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RRB NTPC CBT 2 (Level-3) Official Paper (Held On: 17 June 2022 Shift 1)
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  1. 22
  2. 44
  3. 23
  4. 1

Answer (Detailed Solution Below)

Option 1 : 22
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Detailed Solution

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The correct answer is 22.

Key Points

  • No. of Chromosome in Humans
    • The nucleus of every cell contains microscopic, thread-like components that make up a chromosome.
    • Each chromosome is made up structurally of DNA that is tightly wound around distinct proteins known as histones.
    • There are 46 chromosomes in all, divided into 23 pairs in humans.
    • These 22 pairs—which are the same for both males and females—are referred to as the autosomes.
    • There are differences between the sexes in the 23rd pair of chromosomes, or "allosomes," which is the sex chromosome.
    • When compared to females, who have two copies of the "X" chromosome (44A + XX), males only have one "X" and one "Y" chromosome (44A+ XY).

Additional Information

  • Except for sex determination, autosomes are primarily linked to the numerous metabolic processes that occur within the cell.
  • It occurs half in no. in sex cells (gametes) and in pairs in somatic cells.
  • In humans, each parent gives one of their sex chromosomes to the child, dividing the child's chromosomes equally between the mother and the father.
  • DNA is stored in a cell's chromosomes, which also have components needed for segregation and replication.
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