[Jos]
> I appologise unreservedly for any faliures to answer
> recently, please dont read anything into it other
> than that I'm bogged down at work and then have no
> way to catch up on what I've missed.
> Will attempt to be more attentive.
Jos, your making my point here on the other
thread (Oui and Pirsig). I too fall into the work
hum-drum, and with my son being as young as he is, the
yard is about as far as I get for the most part
recently. At times, I break away and go farther, but
work is getting too negative and I feel it is tiring
me, breaking me down, I'm in the midst of trying to
find another job. A bug guy came today to rid wasps
getting into the roof. I'm give him my resume. I've
been doing applications and handing out resumes to
more and more recently. I feel the need to get out of
this job soon. It is too negative.
[Jos]
> Your job sounds fascinating by the way.
Fascinating, yes. Worthwhile to continue, at
least for me at this point, no. It definitely is an
experience to weigh society against.
[Jos]
> I wasn't very clear and on re-reading I'm unpicking
> my own thoughts further.
> Perhaps it's easier if I ask a genuine question:
> If there are 2 populations of the same species
> living in separate locations, how can using mDNA
> analysis asses which is older if they share a common
> ancestor?
This is a good question. The way I understand the
research is that within the species populations exist
that differ slightly in their genes and we call these
ethnic groups I believe. Where their changes occur is
another branch off the tree. Another word is
subspecies. Subspecies can interbreed, but are
genetically different which provides biological
characteristics that are slightly different. Look at
a picture of a Australian aborigine and compare with
an Australian-European. It is these changes were the
veering from the branch occurs. This is also how
Japanese can be compared with Chinese for example. I
know I'm not able to get into the technicalities for
I'm no expert on this, but this is what I've derived
over the years to be where these conclusions come
from, but I'm open to other inputs on the topic.
[Jos]
> Aren't we just measuring the age of the
> continuous line of that species, making no comment
> on where it was accross the period? If you have two
> populations that are the same species but apparently
> differnt ages is this evidence of convergent
> evolution?
Yes, convergent evolution, and this is why I
believe different hypothesis still exist, such as the
one I pointed out of different locations,
geographically separated, of Homo sapiens evolving
from the already migrated Homo erectus.
As to the numbers, I reread Gav's post and he
says Australian aborigines 400,000. I'm still waiting
to see where Gav sourced this number.
SA
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