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Reply #45: Sorry, but no [View All]

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Home » Discuss » Topic Forums » Science Donate to DU
Ediacara Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Dec-05-05 04:36 PM
Response to Reply #32
45. Sorry, but no
Natural Selection is what makes evolution happen. It isn't random. Genetic Drift: also not random. There may be random cyclicity about a mean, but there are selective pressures keeping the random population fluctuations within a small area. If drift is unidirectional, selection pressures keep it that way. All organisms exist on adaptive peaks. Sometimes these peaks move, sometimes they don't, but just because there is movement, that doesn't mean that any organism can exist in any random configuration. The unidirectional movement, and stochastic variation about a mean is held in place by selective pressures.
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