PSYCH 2AA3 Lecture Notes - Lecture 2: Quantitative Trait Locus, Selective Breeding, Phenotype
14 Jun 2016
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Lecture 2: behavioural genetics - the developing nervous system. Branch of genetics that deal with inheritance of behavioural/psychological trait. *genotype and phenotype don"t always match* (cause: enriched environment v. s isolation) Polygenic inheritance - many genes and environmental factors determine if a certain trait will be expressed. Epigenetics - genes environment affect each other (nature vs nurture argument) - explains why genotype and phenotype may not always match (malnourished, isolation) Methods for studying hereditary in uences: selective breeding. Took rats/mice and found the best/worst runners. Bred best runners with other best runners. Result 7-8 generations later. mice were even worse or even better. Therefor - selective breeding was successful: adoption studies. Measure/observe similarity between children + biological parents v. s children and their adoptive parents. If biological + adoptive parents were both criminals, child would be more likely to be a criminal: twin studies.
