00:01
Haploid gem cell that can reproduce sexually.
00:08
It consists of 10 femtograms dna.
00:12
One multiplied with 10 to the power of minus 15 grams dna.
00:18
The fertilized egg consists of 20 femtograms dna.
00:27
Before dna synthesis occurs, this is the dna present in it.
00:33
Now let us consider the questions that are asked related to this.
00:37
Question a, how much of dna is present in somatic cell in g1 phase? as we come across the cell cycle, in the cell cycle, g1, s phase, m face and g2 phase are present.
01:05
These phases together contribute to the cell cycle.
01:09
In this g1 and g2 are considered to be gap phases, whereas s is a synthetic phase, dna synthesis occurs, m is mitotic phase.
01:32
In the cousine a we come across how much of dna is present in somatic cell in g1 phase.
01:40
In the somatic cell we come across the presence of 20 femtograms of dna.
01:46
Hence the answer is 20 femtograms of dna is present in somatic cell in g1 phase.
01:53
Hence the answer is 20 femtograms.
01:56
Moving to the question b, somatic cell in g2 phase.
02:03
How much of dna is present in the somatic cell in g2 phase? this is 40 femtograms of dna is present in the somatic cell of in the somatic cell 40 fematograms of dna is present because chromatic duplication occurs by this time.
02:27
Once the cell enters g2 phase chromatic duplication occurs.
02:35
And this occurs during s phase of cell cycle.
02:41
Moving to the third question, that is c, c c, somatic cell in prophase, that is how much of dna is present in somatic cell in prophase.
02:57
By the time, cell enters into prophase, dna duplication occurs.
03:03
In somatic cell, 20 grams of dna is present.
03:09
Hence, double of it occurs in synthesis phase...