Mitosis: 2n=12 - Help Understanding Chromosome/DNA Content

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Discussion Overview

The discussion centers around understanding the chromosome and DNA content during the phases of mitosis and meiosis, specifically in the context of a cell with 2n=12 chromosomes. Participants explore the transitions between different phases (G1, S, G2) and the implications for daughter cells, as well as the diploid to haploid transition in meiosis.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant suggests that in G1, the cell has 6 chromosomes and 6 molecules of DNA, in S phase it has 12 molecules of DNA, and in G2 it has 12 chromosomes and 12 molecules of DNA.
  • Another participant questions whether the daughter cell of mitosis should have the same chromosome and DNA content as the G1 phase, expressing confusion about the expected chromosome numbers.
  • There is a discussion about the transition from diploid to haploid in meiosis, with one participant asserting that this occurs in anaphase, while another questions this, noting that the cell is still one cell at that stage.
  • One participant attempts to clarify that during G1, there are 6 pairs of chromosomes and 12 chromosomes, and that at the end of S and G2, there should be 24 chromosomes, which contradicts the earlier claims.
  • Participants express uncertainty about the duplication of chromosomes and the differences between mitosis and meiosis, with one asking for further information on whether the questions pertain to mitosis or meiosis.

Areas of Agreement / Disagreement

Participants express confusion and uncertainty regarding the chromosome and DNA content across different phases of the cell cycle, particularly in relation to mitosis and meiosis. There is no consensus on the correct understanding of these processes, and multiple competing views remain.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about chromosome duplication and the definitions of phases in mitosis and meiosis. Some participants appear to have differing interpretations of the stages and their implications for chromosome content.

Who May Find This Useful

This discussion may be useful for students preparing for exams in cell biology, particularly those seeking clarification on the processes of mitosis and meiosis and the associated chromosome dynamics.

nemzy
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Lets say for example, that a cell contains 2n=12 chromosomes..

In mitosis and..does that mean that in

g1: cell has 6 chromosomes and 6 molecules of dna
s: cell has 12 molecules of dna
g2: cell has 12 chromosomes and 12 molecules of dna

so at the end of mitosis, the cell with have 12 chromosomes and 12 molecules of dna?

what i don't understand is that shuldnt the daughter cell of mitosis be exactly equal to the G1 phase of mitosis in terms of chromosome / dna content?\

also in meiosis, in which mitotic phase does the cell go from diploid to haploid..i thought it was telephose but the answer was anaphase..why? Isn't it still diploid since in anaphase the cell is still one cell

also..lets say a cell contains chrosomome # 2n=12

does the daughter cell of mitosis have the same chrosome #/dna content as G1?

shouldnt that mean that in g1, there is 12 chrosomes

and in g2..there are 24 chrosomomes..but that is not the case, and only 12 chrosomes in g2...

i am so confused ! help please final exam tomrorow
 
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i know the stages of mitosis clearly, but i don't understand the chrosomoes duplicating part...

although that site has plentiful info about mitosis/meiosis that site didnt answer my questions
 
nemzy said:
g1: cell has 6 chromosomes and 6 molecules of dna
s: cell has 12 molecules of dna
g2: cell has 12 chromosomes and 12 molecules of dna

it should be
G1: 6 pair of chromosome and 12 chromosome
At the end of S and G2: 24 chromosomes and 12 (2*6) pairs chromosome.


nemzy said:
so at the end of mitosis, the cell with have 12 chromosomes and 12 molecules of dna?

what i don't understand is that shuldnt the daughter cell of mitosis be exactly equal to the G1 phase of mitosis in terms of chromosome / dna content?\

The daughter cell at the end of Mitosis will be exactly at the point of G and it is

6 pair of chromosome and 12 chromosome

nemzy said:
also in meiosis, in which mitotic phase does the cell go from diploid to haploid..i thought it was telephose but the answer was anaphase..why? Isn't it still diploid since in anaphase the cell is still one cell

Everything has started to segragate during anaphase and stoping the reaction would not results in a diploid

also..lets say a cell contains chrosomome # 2n=12


nemzy said:
does the daughter cell of mitosis have the same chrosome #/dna content as G1?

shouldnt that mean that in g1, there is 12 chrosomes

and in g2..there are 24 chrosomomes..but that is not the case, and only 12 chrosomes in g2...

can you dive more infor on this. Is it still part of metosis that you are asking or is a mitosis question.

Cell that goes through meosis do not go through the exact same cycles as the mitosis cell.
 
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