Tuesday, May 26, 2020

Evolution Of The Endemic South American Animals - 972 Words

Annotation #1 Buckley M (2015) Ancient collagen reveals evolutionary history of the endemic South American ungulates . Proc Biol Sci 282: 20142671–20142671 The article studied collagen found in the fossils of ancient South American animals (Laurasian ‘condylarths’) and compared it with the collagen found in animals present today, mainly xenarthrans (anteaters, armadillos and sloths). The author used the data to compile all the animal species into their respective groups (ungulate). Because the author discovered some discrepancies in the fossil records and the morphology previously thought to be true, he is trying to determine a phylogenetic tree using collagen found in fossils of extinct ancestors of South American mammals. The study required the use of fossil records and the molecular phylogeny. The author isolated proteins found in the collagen of the ancient remains of these creatures and sequenced it. The author then observed the structure using liquid chromatography (tand em mass spectrometry). As a result, a phylogenetic tree was created with many creatures linked based on the collagen protein similarities. The final result was consistent with the actual ungulates of modern South American creatures; however, the author was also able to find the placement of distinctly related groups of mammals within the phylogeny. The conclusion was the fossil record can be used to identify phylogenies based on the molecular structures. The sequencing of collagen has beenShow MoreRelatedDisease Report : Chagas Disease1261 Words   |  6 Pages CHLP 4623 Disease Report: Chagas Disease Hannah M. Lahodny || Dr. Jones || December 16th 2014 Introduction Discovered in 1909 by Carlos Chagas, Chagas disease, or American trypanosomiasis, affects an estimated 8 million individuals annually according to the Centers for Disease Control and Prevention. 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