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Posted by JP on January 16, 1999 at 18:31:10:
In Reply to: JP, I have a question for you posted by Muzzy on January 15, 1999 at 21:51:21:
: You said:
: "As usual, you still fail to comprehend the
: difference between microevolution which is
: caused by natural selection, and macroevolution
: (speciation) which has no known mechanism."
: Like many other creationists, you acknowledge that microevolution occurs but not macroevolution. Yet all of us supporting evolution say that macroevolution is just a long series of microevolutionary events.
: Why can't a 10 million- or 20 million-year sequence of microevolution involving millions of generations produce macroevolutionary change?
Because you have not explained the mechanism for
this change to occur. MIcroevolution works on
all ready present genes and changes in the
frequencies of such and cannot be extrapolated
to macroevolution. If you think it can, let me
ask you this question: If we started out with
a population of bacteria all of which have 1
chromosome as there entire genetic makeup, how
can simple variations in these genes and selection,
after any amount of time, cause organisms with
say, 8, 20, or 46 chromosomes to appear? These
genes were never present, how then does natural
selection work on what is not there?