Question

what will be the dna content of a cell at g1 after s and g2 if the content after m phase is 2c

Answer 1

at G1 phase the DNA content of the cell is 2C.
at S phase the DNA content doubles and the result is 4C.
at G2 phase it remains the same .i.e., 4C.
then after M phase it becomes 2C.
in this way the cycle continues.

Answer 2

G1 = 2c

S= 4c

G2= 4c

Explanation:

• Before mitotic division cell is present in interphase. There are three phages in interphases G1, S, G2. The daughter cell grows in size and produces the enzyme needed for replication in the G1 phase.
• In S phase the DNA replicate and content of chromosome gets double. In G2 phase cells grow in size and prepare to move in mitosis.
• Therefore when DNA content after m phase of a cell is 2c than in the G1 phase it will remain 2c because no replication takes place in this phase.
• In S phase the DNA content will become 4c because DNA replication takes place in this stage and in the G2 phase the DNA content will remain 4c.
• Then when this cell will finish mitosis the DNA content will reduce to half i.e, 2c.

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