identical twins

Geoff Barton gjb at bioch.ox.ac.uk
Wed Jul 3 12:17:09 EST 1996


Brent Gilbert wrote:
> 
> In <4rccbo$1hp at news2.ios.com> knanette at village.ios.com (Nanette Knaster) writes:
> 
> >If identical twins marry identical twins, are the offspring of each
> >marriage (cousins) considered to be siblings genetically since both sets
> >of offspring share the same gene pools.  Can someone explain this?  It was
> >a discussion that came up today at the old watercooler, and I'd be much
> >obliged for a scientific explanation.  Thank you.  Please respond via e-mail.
> 
> Not likely. Remember, almost every cell in the human body, save Erythrocytes
> and sperm/egg cells, have two sets of chromosomes. So, let's say one set of
> twins has the genotype Bb for eye color ( that is, brown eyes, but a carrier
> of the blue eyes trait) and the other twin have the same, the offspring can
> ber either BB, Bb, or bb, hence not identical in this respect.
> --
> ------------------------------------------------------------------------------
> Brent Gilbert (bg005d at uhura.cc.rochester.edu)
> "If you choose not to decide, you still have made a choice" -Neil Peart

I don't think the question was are the offspring identical, rather are
they genetically as similar as  siblings would be?

Interesting.

Geoff.



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