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Q.21. If egg of an organism has 10 Pg of DNA in its nucleus. How much DNA would a diploid cell of
same organism have in phase of meiosis?
(1) 10 Pg
(2) 5 Pg
(3) 20 Pg
(4) 40 Pg
Dear student,
​Please find below the solution to the asked query
Correct option is (4).
Regards
​Please find below the solution to the asked query
Correct option is (4).
- The amount of the DNA given is 1C = 10 picogram.
- As we know normal meiocyte is a diploid cell, so its DNA amount is 2C (C refers to amount of DNA in picogram).
- When the cell starts dividing, it first enters the G1 phase of cell cycle. During this phase only growth of cell takes place and DNA content remains same. Thus, meiocyte in this phase will have 2C DNA content.
- Now, cell enters S phase of cell cycle. In this phase, the replication of parental DNA takes place, so the DNA content becomes double here i.e 4C.
- After this phase, cell enters G2 phase. Here cell again grows and does not replicate any DNA. Thus, here also DNA content remains unchanged i.e. 4C.
- Thus in G2 phase, meiocyte will have DNA content = 4 (C) = 4(10) = 40 picogram.
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