Re: How does a new species emerge?

From: r norman (rsn__at__comcast.net)
Date: 08/26/04 

Date: Thu, 26 Aug 2004 11:32:26 -0400

On Thu, 26 Aug 2004 13:38:41 GMT, Philip Deitiker
<Donevenask@worlnet.att.net> wrote:

>The barrier gene meaning that no extrinsic barrier separates two
>species, the barrier is intrinsic meaning they could potentially
>mate, intermix by choice [key word is choice], but generally
>fail to intermix and when they do mate fail to produce
>crossprogeny that have good reproductive fitness.
>
Isn't this just what is ordinarily called postzygotic reproductive
isolation?