How many DNA strands does a chromosome have?

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SUMMARY

A chromosome consists of two chromatids, each containing one DNA molecule, which is a double helix structure made up of two strands. In a diploid cell, there are 46 chromosomes, equating to 46 DNA molecules when the cell is not replicating. During cell replication, each chromosome duplicates, resulting in 92 DNA molecules. Therefore, the understanding that a diploid cell has 46 DNA molecules and 92 DNA strands during replication is accurate.

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  • Understanding of basic genetics terminology, including "chromosome," "chromatid," and "DNA molecule."
  • Knowledge of DNA structure, specifically the double helix formation.
  • Familiarity with cell replication processes, including mitosis and meiosis.
  • Basic comprehension of diploid versus haploid cell definitions.
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  • Research the process of DNA replication and its phases during the cell cycle.
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  • Investigate the implications of chromosomal abnormalities in human genetics.
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Students of biology, genetics researchers, educators teaching cellular biology, and anyone interested in understanding the fundamentals of DNA and chromosome structure.

sameeralord
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Ok this seems like a simple question but when I checked I get so confused. Please use these terms to answer my question.

1 DNA molecule- This means a double helix (2 strands)
1 DNA strand- This means when you break the double helix and one separate strand

I thought one chromatid contain 1 DNA strand and 2 chromatids make a chromosome and 1 DNA molecule.

So in a diploid cell you have 46 DNA molecules or 92 strands. Is this wrong? :smile:

EDIT: Oh wait I know why I don't understand this. Chromatid also contains a DNA molecule right. When the cell is replicating each chromosome has 2 dna molecules and when it is not it only has one.

So when the cell is not reproducing there are 46 DNA molecules
and when it is there are 92 DNA molecules is that right?
 
Last edited:
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i don't see anything wrong with your logic. Looks right
 

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