Q20 / 180 · NEET 2015 (Phase 1) · Botany

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

  • A
    Twice the number of chromosomes and twice the amount of DNA
  • B
    Same number of chromosomes but twice the amount of DNA
  • Correct answer
    C
    Twice the number of chromosomes and four times the amount of DNA
  • D
    Four times the number of chromosomes and twice the amount of DNA

Solution

S-phase (synthesis phase) is the part of the cell cycle in which DNA is replicated, but a number of chromosome does not change.

If a cell is diploid then after S phase DNA content in the cell will be 4 C and Chromosome in the cell will be 2 N.

While in a gamete,

DNA content in gamete = C

Chromosome in gamete = N

Hence, the Number of chromosome in a somatic cell will be twice than gamete while DNA content will be four times.

Hence, the correct answer is option: 'C'.

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