Evidence for Evolutio1

Evidence for Evolutio1 - Evidence for Evolution Introns of...

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Evidence for Evolution Introns of ancient origins This is number 13 in my series of postings about current research in evolution. I'll summarize two papers from a recent issue of Science, both of which basically reported the same finding. I'm kind of pressed for time today, so this will be a bare bones summary. But, as always, I'll supply the references. First a bit of background. In eukaryotes, (basically all organisms except bacteria) genes typically are not found as a single uninterrupted reading frame. There are sequences interspersed within the coding region of genes. They are excised after the DNA is translated into RNA. These excised DNA sequences are called introns (the coding DNA sequences are called exons). In the two papers I will summarize, the authors present evidence of an ancient origin for introns. According to the endosymbiotic hypothesis of eukaryote evolution, modern day chloroplasts are the descendents of ancient cyanobacteria. These cyanobacteria were engulfed by an ancient cell
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This note was uploaded on 11/14/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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