PSYC 3100 Lecture Notes - Thomas Robert Malthus, Sexual Selection, Natural Selection
16 Sep 2013
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Lecture 5 september 24 (finishing chapter 2) Humans and apes have a common ancestor, continue to breed, we become reproductively isolated now 2 different species. Humans and other creatures will breed far more than the planet will offer resources to it competition, populations grow exponentially, and most resources stay the same or grow arithmetically problem! Thomas malthus (1798) resources can t keep all individuals satisfied. Not every trait is adaptation some are exaptations now enhance fitness but were not built for their current role: e. g. feathers built for warmth, not for flying originally. Shocking that darwin got as far as he did as he knew diddly-squat about genetics: knew mutations were around, but didn t know where they came from didn t understand variation. Key terms and issues (should be able to speak/write a few sentences about each of the following terms/concepts)! Watson & crick (1953: 1953, founded double helix of dna.
