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Centromeres

Debate and discussion of any biological questions not pertaining to a particular topic.

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Postby TheVirus » Wed Nov 04, 2009 3:43 am

Yeah, that would be my thought. Until proven wrong.
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Postby JackBean » Wed Nov 04, 2009 5:36 am

Can you tell me, how the centromere will break? Do you know, what does the centromere look like?
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Postby TheVirus » Wed Nov 04, 2009 5:20 pm

Yeah, that would be my thought.
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Postby JackBean » Thu Nov 05, 2009 5:07 am

TheVirus wrote:Yeah, that would be my thought.

What would be your thought? Did you read it? :roll:
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Postby TheVirus » Thu Nov 05, 2009 11:45 pm

TheVirus wrote:Yeah, that would be my thought. Until proven wrong.

Oh, sorry, i thought these reply of mine above hadn't been posted properly so i posted it again.
Centromeres aren't circles like they're drawn in the books, they're just repetitie DNA sequences, and they look just like any other part of the chromosome... like DNA. And i'm guessing they get separated when the centrioles pull each chromosome's chromatid away in opposite directions through the nuclear spindles (which are like strings that hook to each chromatid).
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Postby Darby » Fri Nov 06, 2009 3:36 pm

There's a chemical change that causes the centromeres to separate. In cells with spindle formation inhibited, the centromeres still separate.
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Postby TheVirus » Fri Nov 06, 2009 5:21 pm

Really? Does that happen in some cells of all organisms, or do you mean that some species have inhibited spindle formation in all their cells? If you mean the second, do you know any example of species?
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Postby Darby » Mon Nov 09, 2009 1:53 am

There's a chemical that inhibits microtubule formation. I've seen video of a cell dividing after being exposed to it - the chromosomes just drift around, and then they all kind of pop apart at the same time.
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Postby TheVirus » Mon Nov 09, 2009 3:25 am

Oh, but that's not a natural chemical, right? I mean, it's not something produced by the cell itself, but in the lab, right?
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