Question

Which factor remains constant even after the S phase has taken place?

Answer 1

S or synthesis phase:

1. S or synthesis phase is the period during which DNA synthesis or replication takes place.
2. During this time the amount of DNA doubles. If the initial amount of DNA is denoted as 2C then it increases to 4C.
3. Although, there will be no increment in chromosome number: for e.g. if a cell has the 2n number of chromosomes at G1, even after S phase the number of chromosomes remains the same, i.e., 2n.
4. Before the cell enters into the S-phase, it has the DNA in the form of chromatin not chromosome.
5. Chromosomes are formed when the DNA is replicated during the S - phase.

Final Answer: There is no increase in the chromosome number; even after the S phase the number of chromosomes remains the same as seen towards the end of the G1, phase.