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Re: Species concepts & interfertility

In a message dated 95-12-19 14:04:14 EST, Thomas_R_HOLTZ@umail.umd.edu (th81)

>For another case, brown bears (Ursus arctos) and polar bears (Ursus
>maritimus) are capable of having offspring (some of which are even
>viable!!).  Although most mammalogists agree that these are separate
>species, they have not yet diverged enough to prohibit chromosomal

Right. I was more interested in how long it would take for mutual infertility
to arise than in pointing out why it could not have happened