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Lecture 4

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Biology 1001A
Tom Haffie

Lecture 4 – Biodiversity Most recent common ancestor (MRCA) for a given group(s), given a phylogenetic tree. - MRCA African Great Apes = Gorillas - MRCA Great Apes = Orang-utans - MRCA Apes = Gibbons - MRCA primates = Lemurs - MRCA mammals = Monotremes - MRCA vertebrates = Jawless fish - MRCA all life = LUCA Why the idea that “humans are descended from chimps” is inaccurate. - Humans are not descended from chimps. - Humans and chimps share an MRCA - Which branched off into humans and chimps along two separate evolutionary lines Order of main branching events in tree of life (dates not testable). - see slide show Cause of global catastrophe associated with mass extinction 65 mya. - Meteor Impact Relative species richness of protostome vs. deuterostome animals - Protostome: Mouth developed before anus - Deuterostome: Anus developed before mouth - There are MANY more protostome compared to deuterostome Why some traditional groupings of organisms (“reptiles”, “fish”) do not reflect ev
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