All human beings can mate with one another, which is the surest way of knowing that they are related. We cannot mate with our supposed current ancestors, the chimpanzee. But what of the various simian kind? Isn't there a difference between homo habilis and homo erectus? Was one considered more or less evolved than the other? Is it possible that one race is more closely related to habilis, while the other is more closely related to erectus?
You are very confused.
First. By your own definition of "species" ("can mate with each other"),
habilis and
erectus would not be able to mate with
sapiens, of any "race", because they are different species.
Second. "Race" is a social classification, not a biological one.
Genomic Research Vol. 12, Issue 6, 844-850, June 2002
Human populations differ one from another almost entirely in the varying proportions of the allelic genes of the various sets of hereditary factors, and not in the kinds of genes they contain.
Differences in allelic frequencies show the genetic diversity
of a species. One species. Capiche?
Different kinds of alleles (aka genes) distinguish
between species.
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