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Assertion : Every chromosome, during metaphase has two chromatids.
Reason : Synthesis of DNA takes places in the S-phase of interphase.
  • a)
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b)
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  • c)
    If Assertion is true but Reason is false.
  • d)
    If both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Assertion : Every chromosome, during metaphase has two chromatids.Reas...
In S phase or synthetic phase chromosomes replicates, DNA content doubles, i.e., 1C to 2C for haploid cells and 2C to 4C for diploid cells. Along with replication of DNA, new chromatin fibres are formed which remain attached in pairs and the number of chromosomes does not increase i.e. 1n to 1n and 2n to 2n. As the chromatin fibres are elongated chromosomes, each chromosomes comes to have two chromatin threads which are attached at centromere. During metaphase, every chromosome have two chromatids. The chromosomes separate from each other during anaphase.
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Most Upvoted Answer
Assertion : Every chromosome, during metaphase has two chromatids.Reas...
Assertion and Reason Analysis:
Assertion: Every chromosome, during metaphase has two chromatids.
Reason: Synthesis of DNA takes places in the S-phase of interphase.

Explanation:

Chromatids in Metaphase:
- During metaphase of mitosis, each chromosome consists of two identical sister chromatids held together at the centromere.
- This is because DNA replication occurs during the S-phase of interphase, resulting in the formation of two identical chromatids.

Synthesis of DNA in S-phase:
- The S-phase of interphase is the phase in which DNA synthesis or replication takes place.
- This process results in the duplication of the genetic material, leading to the formation of two sister chromatids in each chromosome.

Assertion and Reason Relationship:
- The reason provided (synthesis of DNA in S-phase) explains why each chromosome has two chromatids during metaphase.
- The replication of DNA in the S-phase is essential for the formation of identical chromatids, which is observed during metaphase.
Therefore, both the assertion and reason are true, and the reason correctly explains the assertion. Hence, option 'A' is the correct choice.
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Assertion : Every chromosome, during metaphase has two chromatids.Reason : Synthesis of DNA takes places in the S-phase of interphase.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.c)If Assertion is true but Reason is false.d)If both Assertion and Reason are falseCorrect answer is option 'A'. Can you explain this answer?
Question Description
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