Re: Bacteria Planned Mutations?

"Tom Hendricks" <tom-hendricks@xxxxxxx> wrote in message
news:h4ko4t$25c$1@xxxxxxxxxxxxxxxxxxxxxx
Quote from "Out of Control" K Kelly.

"(Barry) Hall found that his cultures of E. coli would produce
needed mutations at a rate about 100 million times greater than
would be statistically expected if they came by chance.
Furthermore, when he dissected the genes of these mutated
bacteria by sequencing them, he found mutations in no areas
other than the one where there was selection pressure. This
means that the successful bugs did not desperately throw off
all kinds of mutations to find the one that works; they
pinpointed the one alteration that fit the bill. Hall found
some directed variations so complex they required the mutation
of two genes simultaneously. He called that 'the improbable
stacked on top of the highly unlikely." These kinds of
miraculous change are not the kosher fate of serial random
accumulation that natural selection is supposed to run on. They
have the smell of some design."
.....

Like DK and Darwin123, I have problems with this statement. As
DK pointed out, it is a mathematical absurdity to suppose that
needed mutations occur 100,000,000 times more than statistically
expected.

I can also think of some glaring counter examples to Hall's view.
Consider transposons. Each time a transposon replicates itself
it is, in effect, a mutation of the genome as a whole.
Transposons are thought to make up a significant fraction of the
total human genome. There can be up to 1 million copies of the
"ALU sequence" transposon in a human genome. Yet, as far as I
know, they are not beneficial.

The maize genome is thought to be 50% transposons.



.

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