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A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has:

1. same number of chromosomes but twice the amount of DNA
2. twice the number of chromosomes and four times the amount of DNA
3. four times the number of chromosomes and twice the amount of DNA
4. twice the number of chromosomes and twice the amount of DNA

Correct answer: same number of chromosomes but twice the amount of DNA

Solution

After S phase, each chromosome has been duplicated into two sister chromatids, but the chromosome number is still counted by centromeres, so it stays the same. A gamete is haploid, so the somatic cell has the same chromosome count as before replication relative to itself, but twice the DNA compared with the unreplicated state.

Related NEET Biology questions

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• Identify the correct statement with regard to G₁ phase (Gap 1) of interphase.
• In ‘S’ phase of the cell cycle:
• During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C?
• In the somatic cell cycle:

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