|The whole truth
Joined: Jan. 2012
|Quote (Jerry Don Bauer @ Dec. 03 2012,09:11)|
|Quote (Henry J @ Dec. 02 2012,20:49)|
|Take the ape-like creature morphing into homo sapiens....at some point in this supposed evolution, an ape has to cross the get-go line and birth a human....the species has to change in order for speciation to occur. |
No. No. No. NO!
Small changes accumulate.
The amount of change from one generation to the next isn't expected to be any more than what we see today between one generation and the next.
The reason large changes aren't expected to emerge (at least not successfully) in one generation (or even a few) is basically what you said; offspring that's too different from its relatives would have trouble finding a mate, or mating successfully if it found one.
Speciation isn't a barrier; any barrier between two species is there because they've been accumulating changes separately for long enough for some of those differences to prevent interbreeding, or at least deter it.
OK, Henry....And ...BTW, thanks for your intelligent, civil posts......speciation happens in small increments....I'm all over that...
But the bottom line has to speak at some point.
And the bottom line says:...at at SOME point...a new species must emerge...that's what speciation IS.
So, At that point when speciation occurs, the proginating species will have to have, by the very definition of the word speciation, give birth to an entirely new species.
That new species will then not be able to interbreed with it's predecessors and must interbreed ONLY with it's own...new...species....
Science says nope......that original birth of a viable (it can live), fertile, (it too can produce offspring) new species isn't going to happen.
jerry, you apparently think that speciation means that one individual speciates at a time, while all the other individuals of a population remain exactly as their ancestors were. Is that what you think?
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