Biology 1001A Lecture Notes - Lecture 19: Archaea, Cladistics, Caddisfly
27 Oct 2018
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~ everything on earth is related to everything else. Some things are more related than others (common ancestors) ~ time runs from the root towards the tips/leaves (modern day species) on all phylogenies. ~ how long ago were the common ancestors how far back in evolutionary time do you. ~ group names given to organisms some names (i. e. monkeys and reptiles(cid:524) don"t. Monophyletic groups (claudes) include all descendants of the group"s mrca accurately reflect evolutionary relationships -> old world monkeys more closely related to us than new world monkeys. Archea more closely related to eukaraya than bacteria. Synapomorphy hard outer membrane (not share with any other animals) ~ i. e. birds are related closely to crocodiles archosauria egg with heavily mineralized, Ancestral number of legs in butterflies some have 6 while others have 4. Evolution doesn"t always proceed in the direction of more complex features (cid:523)i. e. 6 vs.
