Multiple choice

A cell has ‘c’ as the DNA content and ‘n’ as the number of chromosomes. What would be the value of ‘c’ and ‘n' immediately before the cell division in case of mitosis?

  1. 2c and 4n respectively

  2. 4c and 4n respectively

  3. 4c and 2n respectively

  4. 2c and 2n respectively
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

At the beginning of the cell cycle, a diploid cell has 2c DNA content and 2n chromosomes. After S phase (DNA replication), before mitosis begins, the cell has doubled DNA content (4c) but still has the same number of chromosomes (4n sister chromatids). Immediately before mitosis, after replication is complete, the cell contains 4c DNA and 4n chromatids.

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