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From: rej@cornell.UUCP (Ralph Johnson)
Newsgroups: net.misc,net.bio
Subject: Re: Macro-evolution example?
Message-ID: <7103@cornell.UUCP>
Date: Sat, 24-Mar-84 22:27:58 EST
Article-I.D.: cornell.7103
Posted: Sat Mar 24 22:27:58 1984
Date-Received: Sun, 25-Mar-84 13:44:34 EST
References: <564@ihuxb.UUCP>, <2629@rabbit.UUCP>
Organization: Cornell Univ. CS Dept.
Lines: 11

Cabbage, cauliflower, etc. are all the same species.  They have all the
same pests (sigh!) and interbreed.  They are no different from each other
than different types of dogs.

There are quite a few examples of recent speciation in plants, almost all
are due to chromosome doubling and other catastophic events.  There is a
new species taking over the marshes of Great Britain that is a cross
between a native marsh grass and the American species "cordgrass".  I think
I heard that it required chromosome doubling on the part of one of the
parents, and that the new species will not cross with either parent.  Any
European botonists know otherwise?