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On Tue, 4 Jan 2005, Vern Green wrote:
> I don't have any experience with this other than to say congrats.
>
> As far as the geekiness of this goes, I am told non-identical twins are
> hereditary, identical twins are the luck of the draw. So I guess you
> just got lucky my friend.
True.
Fraternal (dizygotic) twinning is associated with race (highest in blacks,
lowest in Asians, whites in the middle), maternal age (older women have
more faternal twins) and with fertility treatment.
Identical (monozygotic) twinning is associated only with an invitro
fertilization procedure called "assisted hatching." Otherwise, it is
quite random and has nothing to do with race, maternal age, etc.
Mike
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