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Number of chromatids in G(1) and G(2) re...

Number of chromatids in `G_(1) and G_(2)` respectively in a somatic cell with 2n=20

A

40,20

B

20,40

C

10,20

D

10,40

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the number of chromatids in the G1 and G2 phases of a somatic cell with 2n=20, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Chromosome Number**: - Given that 2n = 20, this means the somatic cell has a total of 20 chromosomes. 2. **Identify the G1 Phase**: - In the G1 phase (Gap 1 phase) of the cell cycle, the cell has not yet undergone DNA replication. Therefore, the number of chromatids is equal to the number of chromosomes. - Since there are 20 chromosomes in the somatic cell, there will be 20 chromatids in the G1 phase. 3. **Identify the S Phase**: - The S phase (Synthesis phase) is where DNA replication occurs. Each chromosome is replicated to form two sister chromatids. - After DNA replication, each of the 20 chromosomes will have been duplicated into 2 chromatids, resulting in a total of 40 chromatids. 4. **Identify the G2 Phase**: - In the G2 phase (Gap 2 phase), the cell has completed DNA replication. Thus, the number of chromatids remains at 40, as the chromosomes are still in their duplicated form (sister chromatids). 5. **Conclusion**: - Therefore, the number of chromatids in G1 is 20 and in G2 is 40. ### Final Answer: - The number of chromatids in G1 and G2 respectively is **20 and 40**. ---
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