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NTA Abhyas NEET2020BotanyCell Cycle and Cell DivisionPractice

How many chromosomes will the cell have at G1, after S, and after M-phase respectively, if it has 21 chromosomes at interphase?

Options

  1. A22, 22, 11
  2. B22, 22, 22
  3. C11, 11, 11
  4. D11, 22, 22

Correct answer

B. 22, 22, 22

Step-by-step solution

If an interphase cell has 22 chromosomes than the cell at G1 has 22 chromosomes. In S phase on duplication of DNA occurs but chromosome number remains unchanged, thus cell at S phase will also have 22 chromosomes. After the M - phase or mitosis phase equal division occurs and two identical cells are produced having 22 chromosomes each.

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