Question

What will be the DNA content and number of chromosomes in a cell, after S phase as compared to the gamete of the same organisms?

• A. Same DNA content but double chromosome number
• B. Four times DNA content but double chromosome number
• C. Same DNA content but half chromosome number
• D. Half DNA content but double chromosome number

Answer 1

Answer: (B)

During S phase, replication increases the DNA content of the cell from 2n to 4n, so cells in S have DNA contents ranging from 2n to 4n and the cell is still genetically diploid (2n chromosome number).