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Lecture 9

Psych lecture 9 October 10th.docx

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Western University
Psychology 1000

th Psych lecture October 10 , 2013 • Heritability • Genetic base of intelligence • Genetic disorders • How do I estimate heritability? • Is intelligence heritable? • What is the cause of genetic disorders? Next Time: Evolution & Behavior. Scan and finish chapter 4 Reviewed the difference between genotype and phenotype, dominant and recessive Polygenetic effects – traits related to action of more than 1 gene or chromosome. H = variance due to genes/total variance Estimate of how much observed variability due to genetic factors alone. H = 0 (due to environment) 2 H = 1 (due to Genes) • Does NOT indicated extent to which genes are responsible for expression of trait • Taps relative contribution of genes to overall variation in population 2 • All h is telling you is how much is due to environment vs. genes not phenotypic or genotypic • Applies to groups not individuals Example: the black hair colour of Inuit’s: If everybod2 has the same trait and nothing changes, there is no heritability so the answer would be h =0 Note: • H increases as genetic diversity increases 2 • H decreases as environmental diversity increases Differences within groups is due to genetics Differences between groups is due to the environment Heritability of Intelligence – family relationship study • Identical twins are 100% related • Fraternal twins are 50% related • Parents are siblings are 50% related • Grandparents, uncle, aunt are 25% related • 1 cousin are 12.5% related Bouchard –twins that were separated at birth and then met each other years down the road: • Bouchard claims that they still have remarkable similarities even though they’ve never met • Twins had similar medical history, both had dogs named toy, both chewed finger nails, both married a woman named Linda, both had son named Allen, both divorced and remarried a woman with the same name. Galton wrote a book called Hereditary Genius in 1869 • Looked if sons of intelligent people we’re intelligent and successful; and they were • Adopted sons of intelligent men were not • Measured simple motor and sensory abilities (reaction times) faster you react: higher the IQ • Believes that i
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