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Evidence for Evoluti19

Evidence for Evoluti19 - genes from several species of fish...

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Evidence for Evolution A look at cichlid fish in Lake Victoria This is the first in what I hope to be a series of postings. In the series I hope to accomplish two things, establish that evolution is an active branch of mainstream science and that there is indeed an overwhelming amount of evidence in favor of the idea of evolution. Note that no single post is meant to be a proof, just another piece of evidence that supports the theory of evolution. In the October 11th (1990) issue of Nature, Meyer et.al. present of paper aimed at establishing if the cichlid fish species of Lake Victoria (Africa) are monophyletic or polyphyletic. (If they all share a recent common ancestor in that lake or came from separate lineages that invaded the lake). In their paper they sequenced a 363 bp part of the cytochrome b gene and a 440 bp segment of mitochondrial DNA from what is called the control region. They sequenced these
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Unformatted text preview: genes from several species of fish in the lake and a few species from relatively nearby lakes. What they found was the sequences in the Lake Victoria species of fish were all very similar, but they were different from the sequences of fish in nearby lakes. All the sequences are listed in the paper. They came to the conclusion that this indicated the cichlid species of Lake Victoria all derive from a recent common ancestor in the lake. They estimate the time of divergence at about 200,000 years ago based on a model that assumes mutations are relatively constant over time. (The lake, incidentally, had been independently dated to be 250,000 - 275,000 years old) The News and Views section of that issue has an overview of the paper written by John Avise. Also, the cover photo of this issue consists of a picture of several of these fish....
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