Martian human species

[Don McAllister]

One is jumping the gun a bit about making Mars man a new species.  Whether or
not, when and if humankind establishes a population on Mars becomes a new
species, will depend on the degree of gene flow between Earth and Martian
populations.

Americans and Australians have not yet  developed into a new species because of
the quite extensive gene flow. But even a modest amount of gene flow will keep
the populations reasonably free of unique genetic characteristics.

On the other hand if gene flow was practically zero and if there were
differential selective forces or significant genetic drift, then apomorphies
might well develop and one could start talking about a new Martian species.

don
Don McAllister