Question

1. Describe what happens to the amount of DNA in a cell as it moves through the four stages of the cell cycle.

Answer 1

answer- The amount of DNA in a cell as it moves through the four stages of the cell cycle is that,

First G 1 phase- which last for about 6 to 12 hours. In this phase no DNA synthesis takes place. Thus the amount of DNA remains the same ( n ).

Second S phase- DNA synthesis occurs, and the amount gets doubled ( 2n).

Third G2 phase- No DNA synthesis takes place in this phase and thus the DNA content remains doubled ( 2n).

Finally the fourth phase - the M phase or the mitosis , where there is both the nuclear as well as the cell division taking place. Thus the DNA content will get halved (n ).

First the M phase, where