Psychology 1101 test 3

Psychology 1101 test 3 - Genetics and Behavior I. 3 main...

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Genetics and Behavior I. 3 main areas A.  Molecular Genetics : the area of study that looks at genes from a  molecular standpoint. Concerned with the direct study of DNA (chemical),  genes (sections of DNA on a chromosome that has a specific function),  chromosomes (long strings of DNA, found in nuclei). When you combine DNA with other chemicals, ultimately you get a  living organims. Humans are a result of complex chemical reactions  that involve our DNA and other chemicals Genotype: refers to the set of genes that you are born with Phenotype: your set of physical characteristics Genotype   Phenotype, genes didn’t create phenotype by  Genotype + Environment = Phenotype Genotype is like a recipe of how to build your body, but its just a  recipe. Coding vs. regulatory genes/regulatory parts of genes. o Coding: section part of gene that codes for the protein o Regulatory parts of genes that have to do with turning on and off  coding Example: sex chromosomes?? Just like temperature affects whether an alligator will be  male or female, there are other factors of the  environment in determining which “program” should “run”.  Sex chromosomes: Female: XX  Male: XY  At six weeks, human fetuses have ‘both’ reproductive ducts,  which eventually develop into organs In the absence of testosterone, the female system  develops Under the influence of testicular testosterone, the  male system develops.
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So, do sex chromosomes determine your sex? Sure. But  they do it by regulating testosterone In other animals, there is experimental evidence to show  that that happens. They add testosterone to the pre-natal  environment, and you get a physically male rat.  Studies also show that by altering the chemical pre-natal  environment at certain times- you can affect three  important aspects of sexuality 1. Physical sex characteristics 2. Sex-typed behavior – natural differences vs. gender rules- learned differences 3. Sexual Orientation B.  Behavioral Genetics  (nature “vs.” nurture) o Why do people differ psychologically? How responsible is  genetics for the difference? o Most humans aren’t very different genetically from each other o Our genotypes are all very similar, our phenotypes are almost  completely individual/different C . Evolutionary Psychology - focuses on how human beings are similar  to each other because we are all members of the same species- we have  a lot of genes in common.  For Test:  o Do not need to know the specific parts of the brain- (bold point 
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This note was uploaded on 04/02/2008 for the course PSYCH 101 taught by Professor Staff during the Spring '08 term at UGA.

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Psychology 1101 test 3 - Genetics and Behavior I. 3 main...

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