Karyogram (Chromosome map) - how do they arrange them?

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Offline mpt-matthew

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If someone does a karyogram on one of your cells, obviously the chromosomes (of the dividing cell) aren't ordered. They will be messy, but when you see a karyogram someone has gone and ordered tem nicely into homologous pairs. How do they do this?
Im taking it its on the computer afterwards (maybe?) but how do they know which chromosome goes with which.

Look at this:
newbielink:http://en.wikipedia.org/wiki/File:Sky_spectral_karyotype.png [nonactive]

How do they know which chromosome goes with its homologous pair?

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Someone said:

The chromatids do order themselves into pairs during metaphase. All they do is arrange the pairs.

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I replied:
Do they? I know the sister chromatids arrange in a line on the metaphase plate, but the sister chromatids aren't homologous chromosomes.
You can see in this diagram ( newbielink:http://www.uic.edu/classes/bios/bios100/lecturesf04am/metaphase.jpg [nonactive])
the homologous chromosomes (represented by the same colour) are not next to each other.


THANKS
Biological Sciences - University of Leicester, England.

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Offline mpt-matthew

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Karyogram (Chromosome map) - how do they arrange them?
« Reply #1 on: 12/01/2011 14:25:23 »
If you use cells during meiosis aren't the homologous chromosomes lined up at Prophase I?
Though i thought this just used normal cells. hmm [???]
Biological Sciences - University of Leicester, England.