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Lecture 3

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University of Toronto St. George
Michelle Hilscher

Lecture 3 Emotions and evolutionWhat is the origin of life Depends who you ask tha Christians in 16 century Europe Special creation implies immutable species Fossil record reveals 1 Species change2 Speciation 3 Extinction thus species are not immutableb Early evolutionary theories Lamarck Transmutation of species was explained by principle of inheritance of acquired characteristics modification of limb occur during an organisms life time due to increase or decrease used and it is passed on to its offspring Ex Weightlifterwill have very strong and muscular babies Ex Tape birds eyes to prevent sightits offspring will born blindOversight soft heredity phenotype is not always tied in with genotype Lamarck assumed emotion appearance behavior are all tied to the gene c Nonevolutionary precursors to Darwini Charles LyellAddressed the problem with Earths age by looking at layers of the earth Found that species change but it occur very gradually thus if earth is young there is not enough time to accommodate the changesPrinciples of Geology Earth is older than originally thought 100million years not 20003000 years Thus there is enough time for species to changeiiThomas MalthusEnglish political economist Population growth rateFood growth rate Struggle for existence Nature favor the fittest organisms Fitness best adapted to environment physical emotional behavioral characteristics d Darwin and the voyage of the BeagleObserved there are differences within a specie Ex Finches with different beak sizes Due to different dominate food sources on different islands hard vs tender foodNatural selection results from 1 Within species competition Number vs the resources Ex Mate food shelter2 Heritable variationsPhenotype tied to genotype3 Conditions that differentially favor these variations Eg 1 Peppered mothsphysical characteristic black spot moth is favored after the industrial revolution Eg2 Phototropism Emotionalitypsychological Moths that likes light it is a preference for light that is not required to live thus this is a psychological characteristic
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