00:02
Problem 12 says you have a means of measuring the amount of dna in a single cell.
00:07
You first measure the amount of dna during the g1 phase.
00:11
At what points during the remainder of the cell cycle would you expect the amount of dna for cell to change? so in this particular question, we start in g1, which is the growth phase, growth phase one.
00:23
The entire cell cycle is made up of primarily interphase, which a cell spends most of its life in.
00:29
And then a very brief moment of mitosis where it actually divides, and then a brief moment where the cell membrane actually splits as it becomes two cells, which is called cytokinesis.
00:41
So as we look along the path of the cell cycle here, there's two major portions that come to mind for me of the cell cycle where we would actually have varying amounts of dna and drastic changes of the amount of dna.
00:55
And the first one is going to be in s phase, which is the dna synthesis.
01:00
Phase.
01:01
This is where, after interphase, when you have these single chromosomes, maybe chromosomes a, b, and c, this is where they will undergo what is called replication.
01:15
So they will actually duplicate and eventually become paired chromosomes in prophase of mitosis...