http://tinyurl.com/2uv5u2
Another excellent article from Carl Zimmer. This time on the fact
that mice cannot see red, but adding one single gene to their genome -
one which enables humans to see red - enables mice to see red, even
though their brains "grew up" seeing only a dichromatic spectrum.
Here's a primer on color vision courtesy of the Talk Origins archive:
http://www.talkorigins.org/faqs/vision.html
As Richard Dawkins explains in "The Ancestor's Tale" (pp144-155),
humans have trichromatic vision not because we were designed that way,
but because one of our ancestors accidentally duplicated one of the
two "color genes" we had and the duplicate gene was then free to
accumulate mutations sufficient to change its "color" without
affecting existing vision.
Such accidents are not evidence of design. They're evidence of
evolution.
Budikka
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