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Archiver > GENEALOGY-DNA > 2007-10 > 1191725032


From: "Ken Nordtvedt" <>
Subject: Re: [DNA] Why chromosomes ?
Date: Sat, 6 Oct 2007 20:43:52 -0600
References: <IGEOKAGLHNEKPCKPADIGKEACPBAA.bbailey.lowedna@baileyconnection.com>


My guess is leaving an organism without one copy of any particular
chromosome would kill it ?


---- Original Message -----
From: "Lowe DNA" <>
To: <>
Sent: Saturday, October 06, 2007 8:27 PM
Subject: Re: [DNA] Why chromosomes ?


> Ken...
>
> Has anyone ever been able to deactivate or remove, or add a single
> chromosome, from a cell to see what happens ?
>
> Bill
>
> -----Original Message-----
> From:
> [mailto:]On Behalf Of Ken Nordtvedt
> Sent: Saturday, October 06, 2007 7:29 PM
> To: ;
> Subject: [DNA] Why chromosomes ?
>
>
> Putting aside the X and Y chromosomes, I wonder why nature chose to
> package
> our remaining genetic material into 22 chromosomes? Why not just have it
> has one long strand of our genes and so-called junk dna? It could still
> fragment into many pieces, cross over, and recombine the fragments from
> the
> two parents each generation. Segments of the dna could hop to other
> places
> from time to time; genes or segments of multiple genes could copy
> themselves
> in other places in the genome from time to time, and then diverge in
> function, etc. How autonomous are the chromosomes? Do they swim around
> in
> our cells separately or in a linked arrangement of all 22 ? Certainly the
> number of packages --- chromosomes --- changes from time to time in the
> world of life; different species have different numbers of these things.
> So
> this packaging can't be too sacred. Is one long strand of all our dna
> just
> too cumbersome a molecule?
>
> I realize this is a question mainly for the molecular geneticists who read
> this list; but perhaps others have come across the function of having
> separate chromosomes?
>
> Ken
>
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