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Lecture 3

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University of Toronto Scarborough
Michelle Hilscher

PSYC18 Psychology of Emotion Lecture 3: Emotions and Evolution What is the Origin of Life? DEPENDS WHO YOU ASK. - Christians in 16th Century Europe: - Special creation. J species are unchanging - Implies: immutable species J what was here in the past is still here in the same form, there is no change happening But: fossil record reveals: 1. Species change 2. Speciation J new species now that never existed 3. Extinction J species that existed in the past that no longer exist ConseLo;o}o]}[email protected]}]Z E.g., Jean-Baptiste Lamarck (1744-1829) - French naturalist - @LZK]}L}Z ]Z; o Explained by principle of inheritance of acquired characteristics. J useful modification to the physical body get translated to their offspring o e.g., weightlifter J bigger muscles than other babies o e.g., blind birds J taped the eyes shut on birds, if they have babies their babies would be blind - KZ]2Z;soft heredity, phenotype (physical) vs. genotype (unseen genetic makeup). o Soft heredity J traits are related to phenotype not to genotype, changes are not made in the genotype Non-Evolutionary Precursors to Darwin Charles Lyell (1797-1875) - 9}oKZZ>oo; - Principles of Geology: - Earth older than originally thought - 100 million yrs not 2000-3000 yrs. - There is enough time for species change. Thomas Malthus (1766-1834) - English political economist Population growth rate > Food growth rate - L]o; Z a struggle for existence. - Fittest organisms favored. J survival of the fittest - What determines fitness? J anatomical features, behavioral patterns, emotions can make you more or less likely to adapt Darwin and The Voyage of the Beagle Charles Darwin (1809-1882) - Voyage of the Beagle (1831-1836) - LoKL[Z }KL]}L} ]L: - KZ]}LZ; many different species of birds, within species differences there were a lot of different beak sizes, suspected it related to their environments
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