During the cell cycle, the number of chromosomes and the DNA content change as the cell progresses through the different phases. Let's break it down:
G1 Phase (Gap 1 Phase):
The cell has 16 chromosomes.
DNA content is 1C (haploid).
S Phase (Synthesis Phase):
During S phase, DNA replication occurs.
Each chromosome is duplicated, so the cell now has 32 chromosomes.
DNA content is still 1C because although the number of chromosomes doubled, they are still considered as a single chromatid until the completion of the next phase.
G2 Phase (Gap 2 Phase):
The cell still has 32 chromosomes.
DNA content is 2C (diploid) because each chromosome consists of two sister chromatids.
M Phase (Mitosis Phase):
The cell undergoes mitosis, where the chromosomes are separated into two daughter cells.
Each daughter cell receives 16 chromosomes.
DNA content in each daughter cell is 1C because although there are 16 chromosomes, they are still considered as a single chromatid until the completion of the next G1 phase.
So, the DNA content at different phases would be:
G1 phase: 1C
S phase: 1C
G2 phase: 2C (as it's doubled)
M phase: 1C (per daughter cell)
And the number of chromosomes at different phases would be:
G1 phase: 16 chromosomes
S phase: 32 chromosomes
G2 phase: 32 chromosomes
M phase: 16 chromosomes (per daughter cell)
