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Lecture 10

Psychology Lecture 10.docx

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Psychology 1000

Psychology Lecture 10  Heritability  Genetic Base of Intelligence  Genetic Disorders 1. How do I estimate heritability? 2. Is intelligence inheritable? 3. What is the cause of genetic diseases?  Dominant – produces effect in either homozygous or heterozygous mode  Recessive – Only produces effect in heterozygous mode  Polygenetic Effects – Traits related to action of more than 1 gene or chromosome (H2 = S2g /S2g + S2e) o Estimate of how much observed variability due to genetic factos alone o H2  = 0.0 (due to environment)  = 1.0 (due to genes) o Does not indicate extent to which genes responsible for expression of trait o Taps relative contribution of genes to overall variation in population o Applies to groups, not individuals  Must have variability to measure h2  If everyone is the same, h2 approaches 0  H2 increases as genetic diversity increases  H2 decreases as environmental diversity increases Heritability of Intelligence  Notion seems reasonable o Family Relationship Studies  Identical Twins 100% identical  Fraternal 50% identical  Parent, sibling 50% identical  Grandparent, uncle, aunt 25% identical st  1 cousin 12.5% identical o Bouchard – remarkable similarity in family relationship study  Consider Jim Lewis and Jim Spring o Galton: Hereditery Genius  1869-looked at relatives of intelligent people  Sons of highly successful men were too highly successful  However, highly successful men did not have highly successful adopted sons  Measures simple motor and sensory abilities  Believes that intelligence was unitary (mental quickness) o He thought that mental and physical quickness was the same o Unitary means one thing, can be measured easily and solely  Develops Correlation Coefficient o How similar two people are mathematically  Results were dis
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