Question

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
• 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

Answer 1

Answer: (C)

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.