In article <1992Apr27.072849.17251 at yang.earlham.edu> allens at yang.earlham.edu (Allen Smith) writes:
> Actually, from what I know of the subject, differentiation by
>species via the hybridization success test is sometimes a matter of
>definition. There's one "species" ranging from someplace around Florida to
>Washington State, in which the ends can't interbreed. But the middle
>sections can do so, and the hybrids are quite successful.
Rana pipiens, the usual tree frog.
> Also, how does one decide where the species divisions are in the
>past? One can't exactly do a breeding experiment. Sometimes, enough DNA is
>isolatable to run a DNA hybridization check, but where does one draw the
>line? Admittedly, one way would be to look for hybrids. But what if the
>two species in question are seperated by time?
Also, what about ligers and tigons, coyotes, wolves, dogs, and jackals,
Mark A. Fulk Computer Science Department
fulk at cs.rochester.edu University of Rochester
Omit needless words -- Strunk Rochester, NY 14627