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a simple dna question.

Genetics as it applies to evolution, molecular biology, and medical aspects.

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a simple dna question.

Postby wkeyes » Fri Sep 23, 2005 9:50 pm

What's the advantage of having more than one chromosome to house genetic information? An answer would be great, a link would be better.
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Postby MrMistery » Sat Sep 24, 2005 7:59 am

Well, bacteria can fit all their DNA into one single chromosome, but as the DNA molecule gets a lot bigger, you need to fragment it for stability. I may be wrong, i am not sure...
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Postby mith » Sat Sep 24, 2005 12:50 pm

I'll agree with that, DNA is wrapped around histone proteins kinda like threads in spools to prevent tangling and easy unravelling.
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Postby MrMistery » Sat Sep 24, 2005 7:02 pm

However it is not yet understood why some species put their DNA in 2 chromosoms, other 8, 46, etc. I think the record is 1200 and something at a plant called Snake's tongue. I can't remember the actual name of it(memory freeze). What i mean is that there is no standard number of genes/chromosome
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Postby cancer killer » Tue Sep 27, 2005 4:33 am

:) A living organism has roughly 5 feet or 1.5 meters of compacted DNA within it's nucleus!! To contain the DNA within the nucleus of a cell, the genetic information is wound up into Chromosomes.
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Postby NiamhC » Tue Sep 27, 2005 11:00 pm

Bacteria can reproduce by budding or 'cloning' so can get away with one chromosome, but the more complicated organisms need more than one chromosome.
humans use 46 chromosomes (i think thats the right number), grouped into pairs. then when we reproduce we have cells called gametes which have half the number of chromosomes(23) and two of these combine to form a new cell with the correct number of chromosomes. we have too much genetic information to be held on a single pair and also having pairs of chromosomes leads to greater diversity within a species and the ability to evolve certain features. 'natural selection' etc...
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more than 1 chrom.

Postby lara » Wed Sep 28, 2005 10:15 am

2 reduce the effect of undesirable mutations and evade cancer probably!
a guess,OK!
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