Earth Sciences 1083F/G Lecture Notes - Lecture 15: Charnia, Ediacaran, Grypania
12 Sep 2016
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Document Summary
Sex and the simpleton: evolution of sex and the rise of the eukaryotes. Two major explosions: one in the proterozoic eon and one when skeletal organisms appear. Prokaryotes (include archaea and bacteria: distinguished by lack of a true nucleus, term derived from greek pros meaning before and karyon meaning nut (referring to the nucleus) Eukaryotes (eukarya only: distinguished by possession of a true nucleus, term derived from the greek eus or true and karyon, meaning nut (again referring to the nucleus) Very simple cells enclosed by cell wall containing an inner part of amino acids and sugars and an outer part of lipids. Prokaryotes have a single chromosome , contained within a. Nucleoid region rather than a distinct membrane-bound nucleus. Prokaryotes reproduce by the simple process of binary fission. The cell makes an identical copy of its genetic material, and each of the two copies ends up in each daughter cell. The daughter cells are clones of their parent.
