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Question

You have studied Mitosis in onion root tip cells. Can you tell how many chromosomes will the cell have at G1 phase, after S phase, and after M phase? Also what will be the DNA content of the cells at G1, after S and at G2 , if the content after M phase is 2C?

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Solution

If the chromosome number in root tip cell of onion is 16, then it will have 16 chromosomes at G1 phase , after S phase and even after M phase.

If it has 2C of DNA after M phase, the DNA content at G1 phase will be 2C, after S phase 4C and at G2 phase 4C.


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