Molecular evidence for the origin of birds.
- 29 March 1994
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 91 (7), 2621-2624
- https://doi.org/10.1073/pnas.91.7.2621
Abstract
The major groups of amniote vertebrates appeared during a relatively short time span at the end of the Paleozoic Era, a fact that has caused difficulty in estimating their relationships. The fossil record suggests that crocodilians are the closest living relatives of birds. However, morphological characters and molecular sequence data from living amniotes have repeatedly challenged this hypothesis by indicating a bird-mammal relationship. DNA sequences from four slow-evolving genes (mitochondrial 12S and 16S rRNA, tRNAVal, and nuclear alpha-enolase) now provide strong statistical support for a bird-crocodilian relationship.Keywords
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