Q.

If a daughter cell of a plant after mitosis contains 8 chromosomes and 16 pg DNA, then the number of chromosomes and the amount of DNA respectively at the end of S phase is:

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a

4, 16pg

b

8, 32pg

c

8, 16pg

d

16, 16pg

answer is B.

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Detailed Solution

After mitosis a cell 2n number of chromosome and 2c amount of DNA. After S phase, the amount of DNA doubles and the number of chromosomes remain the same. Therefore, number of chromosomes =2n= 8 and the amount of DNA is 4c= 16x2= 32pg.
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If a daughter cell of a plant after mitosis contains 8 chromosomes and 16 pg DNA, then the number of chromosomes and the amount of DNA respectively at the end of S phase is: