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PSYC 3100
Hank Davis

PSYC 3100 – Week 3 Lecture 5 – September 24 (Finishing Chapter 2) - Does natural selection work at the level of the organism? Or does it work at the level of the gene? Are we selecting for the species or the group? - Eventually, there will be enough change in a species so that you will end up with 2 groups of animals who are reproductively isolated – start with common ancestor but will continue to grow and change eventually to produce 2 sub-species o E.g. 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. What to do? Only 2 possibilities for more shelter, more food, etc. o Moral restraint (keep it in your pants) o We need war, famine, disease – it‟s tragic, but absolutely necessary to cull the population of otherwise irresponsible species o Classist, highly educated up-scale guy who thought it was the lower-class that was breeding irresponsibly, thought natural disasters were well aimed because they were at lower class people  Today you hear “wrong people doing all the breeding”, that is a 2012 version of Thomas Malthus o Lower class are less responsible than upper class o Malthus did not see the way the media viewed breeding rate, network news will feature a story on a couple with 12 kids, they cute-ify – don‟t have the resources to look after all 12 children, maybe 2 of them – by showing their kids, they are showing that irresponsible breeding is cute - Sexual selection - Not every trait is adaptation – some are EXAPTATIONS – now enhance fitness but were not built for their current role o E.g. feathers – built for warmth, not for flying originally Lecture 6 – September 26 Chapter 3 - Genetics - Shocking that Darwin got as far as he did as he knew DIDDLY-SQUAT about genetics o 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) o 1953, founded Double Helix of DNA. Won Nobel Prize - Genes/Chromosomes o Genes have particular spot on particular chromosome (of which there are 23 pairs) o 50/50 chance of getting gene from Mother/Father o Genes shape phenotype - Alleles – alt alleles (T vs. t) o Genes – can be 2 different forms in one area o Why are there alternate alleles? In some cases there are no alternate alleles, but in others alternate alleles exist (e.g. blood type) - Mutations o Mutations are basis of variation o Come into being because body screws up, they are „copying errors‟ – in order to pass on gene it has to be copied. o Pose no advantage, and get selected out before they get going – but once in a while the body may enjoy the mutation
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