DNA being carried by each chromosome

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Discussion Overview

The discussion revolves around the understanding of DNA content in chromosomes during different phases of the cell cycle, specifically focusing on the transition from a 4n state in Interphase to a 2n state in Anaphase. Participants explore the implications of chromatid structure and the distribution of DNA during cell division.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant expresses confusion regarding the DNA content in chromosomes, questioning whether each chromatid contains one DNA molecule, leading to two molecules per chromosome.
  • Another participant confirms that one chromatid is an entire double helix, suggesting that the transition from 4n to 2n is understood by the context of Anaphase.
  • A participant reflects on their initial confusion and clarifies that 4n indicates a doubling of DNA for division into two daughter cells, rather than implying two chromosomes.
  • Another participant agrees and simplifies the n vs 2n distinction as a haploid versus diploid concept.

Areas of Agreement / Disagreement

Participants generally agree on the basic concepts of DNA content and the transition from 4n to 2n, but some initial confusion and clarification indicate that not all aspects are fully resolved.

Contextual Notes

There are indications of confusion regarding the interpretation of diagrams and the definitions of haploid and diploid states, which may affect understanding.

leah3000
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Hi

I'm a little bit confused in terms of the DNA being carried by each chromosome.

When the cell is described as 4n in Interphase; with 4 copies of each DNA molecule, does this mean that each chromatid has 1 molecule of DNA? Hence, allowing 2molecules of DNA per chromosome?

Also can someone explain how the cell goes from 4n to 2n in Anaphase?
 
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Yes one chromatid is an entire double helix by itself. from 4n to 2n, well since you already mentioned anaphase, don't you think you know the answer already
 


ok...I think I was looking at the diagrams and sort of confused myself. Now that I think about it 4n would just mean doubling the DNA so that the cell can divide into 2 daughter cells. It wouldn't necessarily mean 2 chromosomes which would give the 4 DNA molecules.

So then 2n would just mean the DNA distributed to the daughter cells...is that correct?
 


yeah you got it, the n vs 2n thing is just a haploid vs diploid thing
 


cool. Thanks very much for your help:approve:
 

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