|
|
Due to spam and off-topic content, these forums are being phased out and replaced with new great books forums. Please join us!
Posted by Fred on January 17, 1999 at 20:40:50:
In Reply to: Re: macroevolution posted by JP on January 17, 1999 at 14:59:47:
: : : : 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?
: : The mechanism is natural selection. You have already acknowledged that natural selection is responsible for microevolution. The question is why can't a 10 million- or 20 million-year sequence of microevolution involving millions of generations produce macroevolutionary change?
: This is nice, but you still havn't answered my
: question. I asked you how natural selection
: supposes to take a single bacterium, with one
: chromosome, to creatures with 8, 22, or 46
: chromosomes. Natural selection works on all
: ready present genes, we all know this. Your
: reply to this was the answer is natural selection.
: How does natural selection do this? Your answer:
: natural selection.
It seems to me that I asked you a question and you are the one who hasn't answered. Answer mine first.