First slide

Cell Cycle

Question

A cell has 20pg of DNA and 4 chromosomes in the $G_{1}$ phase. Calculate the number of chromosome and the amount of DNA in at the end of S phase.

Easy

A

20 pg DNA and 4 chromosomes
B

40pg DNA and 8 chromosomes
C

20 pg DNA and 8 chromosomes
D

40 pg DNA and 4 chromosomes

Solution

During the S phase the number of chromosomes remain the same but the amount of DNA doubles.
Therefore, the amount of DNA becomes 20 X 2=40 pg and the no. of chromosomes still remains the same, i.e., 4 chromosomes.

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