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oct 4 lecture- Gene Action, Dominant Recessive Traits, Polygenetic Effects .docx

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Western University
Psychology 1000

Genetics 10/4/2012 10:21:00 AM Gene Action Dominant Recessive Traits Polygenetic Effects Next Time: Heritability Scan: 117-123 Video: Alzheimer’s—might be as a result of genetics, but don’t know how genetic errors caused it. Accumulation of plaques in the brain. Genetic influence on behavior: identical twins are genetically identical, they have the same traits, probably have the same disorders. However, there are environmental triggers as well Today’s Questions:  how do genes “work”?  what is the outcome with recessive genes?  how is more complex behavior coded? FROM CHAPTER 3: We would expect a 1 year old child to recover from traumatic brain damage more quickly than an adult. Why? a. young children have strong immune system b. young children have more synapses c. young have smaller brains d. adults engage in riskier behavior e. adults are less lateralized Genetics of Behavior  Nature (something we’re born with) vs. Nurture (something we learn). Both of them interact to make human being-both very important  Nature o Genes:  Strand-like molecules of DNA  linked on chromosomes  karyotype: genetic blueprint o Humans: 23 pairs: 22 Autosomes + sex chromosomes: XX-female, XY-male o Genes (strings of DNA molecule) provides template for  RNA codes for  protein molecules (sequence of amino acids)-do everything, influence a human being. o the influence of genes is through protein synthesis...there are no genes “for” a particular attribute o gene "for" intelligence?  Reaction time o So why not just Nature? o environmental can influence protein synthesis as well o genes determine range of possibilities, but NOT degree of expression  Critical Period o Environmental exposure at specific interval is critical o e.g. white-crowned sparrow must hear adul
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