PSY100H1 Chapter 3: PSY100 Psychological Science (3rd Ed.) Textbook Notes Chapter 3
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PSY100H1 Full Course Notes
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Behavior geneticists (study how genes and environment interact to influence psychological activity) use two methods to assess the degree to which traits are inherited: twin studies and adoption studies. Monozygotic twins: (identical twins) results from one zygote (fertilized egg) dividing in two; each twin has same chromosomes and the same genes on each chromosome. Dizygotic twins: (fraternal twins) result from two separately fertilized eggs developing in the mother"s womb simultaneously (no more similar genetically than any other pair of siblings) Evidence suggests twins raised apart may be more similar to twins raised together (when parents encourage individuality) Adoption studies: compare similarities between biological relatives and adoptive relatives (e. g. similarities among nonbiological adopted siblings have more to do with environment than genes); growing up in same home actually has little influence on many traits like personality. Heredity: the transmission of characteristics from parents to offspring by the means of genes.
