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This article about Neanderthol genes in modern humans seem to be well write.
Neanderthals, Cro-Magnons, and modern humans are all the same kind of being.
The researcher claimed that Neanderthals and Cro-Magnons were at the edge of biological compatibility. Whether or not that is true there are cases when breeds of the same kind of plant have passed that point. This is why I don't believe biological compatibility is convincing evidence that two creatures are different kinds.
Yes, they could have been two extremes within the same species. Variation within species is quite diverse. But do they diverge that much that they can no longer reproduce together. And if so, then how does a mutant reproduce without also there also being a member of the opposite sex who also mutated at the same time and more incredibly was compatible too.
The whole point about a species coming from another means that the mutant has no one to reproduce with. So end of the line.
T8,
In plants as far as I have heard but there are sometimes environmental circumstances that allow crossbreeding.
We have a number of creatures that have extremely limited ability to crossbreed. An example is a horse and a donkey.
How do we really know that a horse and a donkey are the same species or not. If they can mate, that would by one definition make them the same species. But many argue they are not because their offspring are infertile. But is that merely just the end of the line for variation within species in order to place a boundary of the variation so that it doesn't diverge into another species, by reason of the infertility?
Quote (t8 @ Feb. 04 2014,16:58) How do we really know that a horse and a donkey are the same species or not. If they can mate, that would by one definition make them the same species. But many argue they are not because their offspring are infertile. But is that merely just the end of the line for variation within species in order to place a boundary of the variation so that it doesn't diverge into another species, by reason of the infertility?
T8,Actually there are extremely rare fertile mules. From what I know all Equines can be crossbred. That lack of fertility could well be a boundary as some might say. A least some felines can also be crossbred. It is an interesting study but it ended at a solid wall when I did the research as an amateur.
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