BISC 120Lg Lecture Notes - Lecture 2: Choanoflagellate, Archenteron, Ectoderm
19 Jan 2016
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Document Summary
32. 1: animals are multicellular, heterotrophic eukaryotes with tissues that develop from embryonic layers. 32. 2: the history of animals spans more than half a billion years. Nobel prize for medicine 1995: edward b. lewis, christiane nusslein-volhard and eric wieschaus, discoveries concerning genetic control of early embryonic development . Hox genes discovered by genetic analysis of mutant fruit flies. 770 million years ago ancestor may have resembled modern choanoflagellates = protists that are the closest living relatives of animals steps in the origin of multicellular animals: identifying protists groups closely related to animals. Proterozoic eon at the close of precambrian time an important landmark in the evolution of life on earth: immediately predate the explosion of life-forms at the beginning of. Cambrian period 541 mya named after ediacara hills of south australia (where they were discovered in 1946) first metazoans (animals made up of more than one type of cell) that required atmospheric oxygen for their growth.
