00:02
If a cell has 20 chromosomes during g1 of interface, how many chromosomes would be present during prophase? so g1 is the first stage of the interface.
00:13
So the next stage, you have a s phase.
00:17
During s phase, dna replicated cell.
00:21
However, if you have a single chromosome and the chromosome, dna replicated cell, you will produce two copies.
00:29
And these two copies are called the sister chromatids.
00:33
Although you have two copies, these two copies of chromatids, they're still attached to each other by the centromereous.
00:43
So technically, although it has two copies of dna, it's a single chromosome.
00:49
So you still have 20 chromosome, although you have 40 copies of dna.
00:55
So once s is over, it's going to move on to g2 to get everything ready for the checkpoint.
01:01
Once g2 checkpoint is over, the cell is going to move into the actomatosis, which will be the first phase, pro phase.
01:11
So during pro phase, again, you still have the same number of chromosome compared to the s phase.
01:18
You still have 20 chromosomes.
01:21
However, you have 40 copies of dna due to the dna replication...