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Introduction to Genetics

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Author Topic:   Introduction to Genetics
sfs
Member (Idle past 2561 days)
Posts: 464
From: Cambridge, MA USA
Joined: 08-27-2003

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Message 24 of 236 (678847)
11-10-2012 9:30 PM 		Reply to: Message 21 by Faith
11-10-2012 7:30 PM

Re: QUESTION ONE: Species ID / CHROMOSOMES
Faith writes:
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They are numbered so that you run across such statements as "such and such a gene on Chromosome 15," so the question is whether this sort of locatability perhaps gives a chromosome its peculiar identity, even a raison d'etre.
The particular set of genes on a chromosome give it its identity, but there (mostly) isn't anything special about which genes are where. Big chunks of genes can be swapped between chromosomes without it having any real effect on the organism, or example.
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 Message 21 by Faith, posted 11-10-2012 7:30 PM Faith has replied
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 Message 26 by Faith, posted 11-10-2012 10:42 PM sfs has replied
  
sfs
Member (Idle past 2561 days)
Posts: 464
From: Cambridge, MA USA
Joined: 08-27-2003

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Message 32 of 236 (678919)
11-11-2012 11:14 AM 		Reply to: Message 26 by Faith
11-10-2012 10:42 PM

Re: QUESTION ONE: Species ID / CHROMOSOMES
Faith writes:
​
But let me ask: Is this swapping a rare occurrence or fairly common?
Call it uncommon, although not extremely rare -- it happens in humans in something like a few births per thousand. It's not the norm, and is best ignored when trying to get the basic picture in focus. As someone pointed out, every rule in biology has exceptions (including the rule that all rules have exceptions).
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