Re: Random genetic changes
- From: CreateThis <CreateThis@xxxxxxxxxx>
- Date: Sun, 02 Apr 2006 17:22:37 -0500
Iain wrote:
Johan wrote:
It´s not proven that random genetic changes is the reason for evolution,
Evolution is genetic change, so random genetic change is a form of
evolution.
I'd say that evolution originates with genetic changes in individuals,
but is defined by their eventual proliferation in the population.
That leaves out controversial bits such as whether genetic changes in
individuals are random and whether they proliferate because of mindless
forces such as their likelihood of being reproduced.
Of course, the _way_ a species changes over time is determined by the
sieving of variation produced by the mutation that occurs at every
reproductive act. During a time when a predator feeds on the
individuals that look least like leaves, the appearence of the average
individual is propelled toward a more leaf-like appearence, and so on,
hence the likes of leaf insects, etc. That's the neatest example of
evolution, useful because it can be observed within lifetimes.
I like the 'sieving of variation' description - it suggests the wealth
of variation and keeps the environment prominently in the picture.
CT
.
- References:
- Random genetic changes
- From: Johan
- Re: Random genetic changes
- From: Iain
- Random genetic changes
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