Evolution/Generation Time

Toby Bradshaw toby at stein2.u.washington.edu
Fri Oct 15 08:52:46 EST 1993


In article <7892 at krafla.rhi.hi.is>,
Helgi Briem Magnusson <hbriem at rhi.hi.is> wrote:
>I would like to point out that almost all mutations are due to
>mistakes made by the DNA polymerase when making copies and not
>due to external agents such as radiation or mutagens.  Also,
>while we do not know if the rate of evolution depends on the
>mutation rate, it is extremely unlikely to unless a trait has
>been under extremely severe selection (selective death > 0.5*N)
>for a long time.  Such severe selection would tend to deplete 
>genetic variability, making mutation a limiting factor.

Is this true in self-fertilizing organisms?  It certainly is not
true in facultative or obligate apomicts or parthenogenotes, and
these take in a lot of territory in flowering plants.

-Toby Bradshaw
toby at u.washington.edu



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