Molecular Biology and Evolution, Vol 13, 1032-1038, Copyright © 1996 by Society for Molecular Biology and Evolution
U Sorhannus
Molecular evolutionary rates within two protistan and three metazoan taxa
were estimated using divergence times derived from fossil records. The
results indicate that the small-subunit rRNA sequences within Dasycladales
(Chlorophyta) and Bacillariophyceae evolved at a rate approximately two to
three times faster than that estimated within Echinodermata, Mollusca, and
Actinistia-Tetrapoda. It was concluded that this twofold discrepancy
demonstrates actual taxonomic differences in the fixation rate of mutations
in the small-subunit rRNA.
ORIGINAL ARTICLE
Higher ribosomal RNA substitution rates in Bacillariophyceae and Dasycladales than in Mollusca, Echinodermata, and Actinistia-Tetrapoda
Department of Biology, Edinboro University of Pennsylvania 16444, USA. usorhanns@edinboro.edu
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