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If the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?
- a)C
- b)2C
- c)3C
- d)4C
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
If the DNA content of an onion tip cell is 2C at the end of the M-phas...
If the DNA content of an onion tip cell is 2C at the end of the M-phase, then its DNA content would be 4C at the end of the S-phase. During the S-phase of the cell cycle, DNA replication takes place, and the amount of DNA in the cell doubles. At the end of the S-phase, each chromosome consists of two identical sister chromatids, which are held together at the centromere. Thus, the DNA content of the cell is doubled from the G1 phase (2C) to the end of the S-phase (4C), and it remains the same through the G2 phase. Therefore, if the DNA content of an onion tip cell is 2C at the end of the M-phase, it means that the cell has completed the mitotic division and has two sets of chromosomes. If the cell then enters the S-phase, it will replicate its DNA, resulting in the DNA content of 4C at the end of the S-phase.
Topic in NCERT: S phase (Synthesis)
Line in NCERT: "During this time the amount of DNA per cell doubles. If the initial amount of DNA is denoted as 2C then it increases to 4C."
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If the DNA content of an onion tip cell is 2C at the end of the M-phas...
Understanding DNA Content in Cell Cycle Phases
The cell cycle consists of several phases, including M-phase (mitosis) and S-phase (synthesis). The DNA content varies across these phases.
DNA Content at M-phase
- At the end of the M-phase, the DNA content of the onion tip cell is 2C.
- The "C" refers to the amount of DNA in a haploid set; thus, 2C indicates that the cell is diploid (having two sets of chromosomes).
Transition to S-phase
- After M-phase, the cell enters S-phase, where DNA replication occurs.
- During S-phase, each chromosome is duplicated, resulting in the formation of sister chromatids.
DNA Content at the End of S-phase
- As a result of DNA replication during S-phase, the DNA content doubles.
- Therefore, if the DNA content is 2C at the end of M-phase, it becomes 4C at the end of S-phase.
Conclusion
- The correct answer is option 'D' (4C).
- This means that DNA content increases from 2C to 4C, reflecting the preparation for the next M-phase where the cell will divide again.
Understanding this process is crucial for grasping the fundamentals of cell division and the continuity of genetic material.
The cell cycle consists of several phases, including M-phase (mitosis) and S-phase (synthesis). The DNA content varies across these phases.
DNA Content at M-phase
- At the end of the M-phase, the DNA content of the onion tip cell is 2C.
- The "C" refers to the amount of DNA in a haploid set; thus, 2C indicates that the cell is diploid (having two sets of chromosomes).
Transition to S-phase
- After M-phase, the cell enters S-phase, where DNA replication occurs.
- During S-phase, each chromosome is duplicated, resulting in the formation of sister chromatids.
DNA Content at the End of S-phase
- As a result of DNA replication during S-phase, the DNA content doubles.
- Therefore, if the DNA content is 2C at the end of M-phase, it becomes 4C at the end of S-phase.
Conclusion
- The correct answer is option 'D' (4C).
- This means that DNA content increases from 2C to 4C, reflecting the preparation for the next M-phase where the cell will divide again.
Understanding this process is crucial for grasping the fundamentals of cell division and the continuity of genetic material.
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If the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?a)Cb)2Cc)3Cd)4CCorrect answer is option 'D'. Can you explain this answer? for NEET 2026 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about If the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?a)Cb)2Cc)3Cd)4CCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?a)Cb)2Cc)3Cd)4CCorrect answer is option 'D'. Can you explain this answer?.
If the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?a)Cb)2Cc)3Cd)4CCorrect answer is option 'D'. Can you explain this answer? for NEET 2026 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about If the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?a)Cb)2Cc)3Cd)4CCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?a)Cb)2Cc)3Cd)4CCorrect answer is option 'D'. Can you explain this answer?.
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