Re: Species and Hybrids (was: Oh piss off *spoilers*)


"solar penguin" <solar.penguin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
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L. Ross Raszewski <lraszewski@xxxxxxxxxx> wrote:

On Sun, 19 Feb 2006 13:28:21 -0000, Chancellor_Goth
<eyeof@xxxxxxxxxxxxx> wrote:

"solar penguin"
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Chancellor_Goth <eyeof@xxxxxxxxxxxxx> wrote:

"solar penguin"
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Dark Monk's Diary <darkmonksdiary@xxxxxxxxxxxxxxxxxx> wrote:
"solar penguin"
<solar.penguin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote in message

Cattle can mate with bison or buffalo to produce
fertile hybrids, and they're not even in the same genus, never
mind the same species. Some species of finches can crossbreed
to produce fertile hybrids. So can some species of plants.

The question of sterility or fertility depends mostly on whether
the hybrid has an odd or even number of chromosomes, not on
whether the parents are in the same species.

Btw, bison/buffalo *are* cattle, certainly the same species if
they can have offspring. You're perhaps thinking of varieties,
like dogs have.

No. Different species. Cattle belong to species Bos taurus (also
known as Bos primigenius). European bison are the species Bison
bonasus. And, just to get you really confused, American buffalo
are the species Bison bison. Three different species, but they
can interbreed to produce fertile offspring.

Well, same species different genus... by definition...

Same species, different genus? That's not possible. Species is a
subclassification within genus. A species can belong to one - and
only one - genus. There's no overlap.

And if they were the same species, _which_ species is it? Bos
taurus, Bsion bonasus, or Bison bison?

Teehee, all the latin has been overtaken by DNA testing and
correlation.

Speciation is defined by whether the DNA is close enough to allow
conception to parturition.

Frankymole



That is *a* definition of speciation. There are others.

And even so, so what? What you've established isn't that different
species can't interbreed, it's that things that can interbreed aren't
different species. Which means that no matter how disparate the
evolutionary lines, no matter how physically different two individuals
appear to be, if they can interbreed, then, by that definition,
they;re the same species.

And even that isn't true. Like I keep saying, cattle can interbreed
with buffalo/bison, and they're not the same species or even the same
genus.

Speciation is being rewritten by DNA analysis - and is they can interbreed
AND produce fertile offspring, they're the same species. Easy. What other
definition of species, not involving DNA or breeding, makes sense?




.

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