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DNA Forum Discuss DNA, the molecule of hereditary. Topics include DNA structure, DNA replication, DNA function.


Does DNA make up a chromosome?

Does DNA make up a chromosome? - DNA Forum

Does DNA make up a chromosome? - Discuss DNA, the molecule of hereditary. Topics include DNA structure, DNA replication, DNA function.


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  #1  
Old 03-29-2007, 06:04 AM
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Default Does DNA make up a chromosome?



is it just one strand? I'm confused as to how a choromosome gets its X shape
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Old 03-29-2007, 06:22 AM
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not exactly...

One exists. as a direct result of the other.
I don't think that "Make up" are the right words?
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Old 03-29-2007, 06:38 AM
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a chromosome is just folded up many strands of DNA.
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Old 03-29-2007, 07:24 AM
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Actually, a chromosome is DNA plus associated proteins called "histones." DNA alone does not equal a chromosome. Also, the DNA can be tightly wound up but in some areas it may be un-wound or exposed so it can make mRNA for protein sythesis.
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Old 07-23-2010, 10:00 PM
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Default Re: Does DNA make up a chromosome?

A chromosome forms when a cell enters in the mitosis phase (is going to divide). Humans have 46 single chromatid chromosomes but during mitosis they become double chromatid, called sister chromatids, which make them look like "X" at the microscope.
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Old 08-11-2010, 06:56 AM
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Default Re: Does DNA make up a chromosome?

A chromosome is a single, extended, double-stranded DNA molecule. In many prokaryotes, the "chromosome" is circular, but formally chromosome only applies to the linear DNA molecules that make up the nuclear genome of eukaryotes.

In the cell, DNA is associated with many proteins, including histones, transcription factors, modifying enzymes etc. So cytologically, each chromosomes is a mixture of a single dsDNA molecule and proteins. In a non-dividing (interphase) cell the chromosomes are loosely packed in the nucleus. The X-shape can only be seen in the metaphase of mitosis. This is because before mitosis, each chromosome has been replicated and the two sister chromosomes are connected to each other at the centromere. The DNA-protein of the chromosomes has been condensed at this stage and we see the traditional X (or Y-shape for acrocentric chromosomes), where each half of the X is one sister chromosome. In the anaphase, the two daughter chromosomes separate and migrate to opposite poles of the cell, thus ensuring that the daughter cells each receive a full complement of genetic material.
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Old 08-31-2010, 05:13 AM
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Default Re: Does DNA make up a chromosome?

Actually, not exactly! No any relation between each other.
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Old 09-22-2010, 05:25 AM
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Default Re: Does DNA make up a chromosome?

I think chromosome can be considered as a single twisted DNA structure containing thousands of genes that makes up the blueprint
of living organisms
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