l15 - Biological Approaches ATP PAID 5: Biological Aspects...

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Tom Farsides ATP PAID 5: Biological Aspects of Personality Biological Approaches
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Tom Farsides ATP PAID 5: Biological Aspects of Personality Lecture contents Genotype and phenotype: Determination and interaction Group differences. Heritability indices. Population variation in IQ: Heritability and the environment. What can and cannot be inferred from heritability indices.
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Tom Farsides ATP PAID 5: Biological Aspects of Personality Influential types Genotypic characteristics are genetic potentialities . Mono genetic and poly genetic influence. E.g., brown eyes and height. Phenotypic traits are manifest characteristics. I.e., influenced by some mix of genes and environment. Genetic determination If gene, then phenotype (irrespective of environment) Gene-environment interaction If gene and a particular environment, then a particular phenotype
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Tom Farsides ATP PAID 5: Biological Aspects of Personality Group Differences 0 20 40 60 80 100 120 Group 1 Group 2
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Tom Farsides ATP PAID 5: Biological Aspects of Personality Group Differences: The U.S. Immigration Act of 1924 Lower mean ‘intelligence’ for southern and eastern than for northern Europeans in America. U.S. Immigration Act of 1924 set rigid quotas to restrict the influx of these “biologically weaker stock.” ‘Intelligence’ measure scores improved with years of residency Familiarity with language and with USA cultural knowledge. No group differences after years of residency. A seemingly hereditary difference was revealed as due to environmental factors contingently associated with ‘genetic’ ones.
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Tom Farsides ATP PAID 5: Biological Aspects of Personality Group differences: Do not imply particular causation Numerous studies have found that average IQ for U.S. blacks is 85-90, i.e., mean 10 to 15 points lower than for U.S.
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l15 - Biological Approaches ATP PAID 5: Biological Aspects...

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