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Dan Meegan (16)

Behaviour Genetics and Evolutionary Psychology.docx

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PSYC 2410
Dan Meegan

Behaviour Genetics and Evolutionary Psychology October-27-13 8:15 AM Behaviour Genetics: The study of the power and limits of genetic and environmental influences on behaviour. Studies individual differences due to genetic differences Genes can be active (expressed), or inactive. Environmental events can turn genes on which enables the gene to provide the code to make certain proteins  Genotype: Genes. 22 pairs of autosomes that are the same in males and females with one pair (XX, XY) differing for sex  Phenotype: Observable characteristics 96% of our genetic sequence is shared with chimpanzees Geneticists are interested in the small variations between sequences that result in the diversity of each human  FOXP2: Transcription factor that regulates gene expression during brain development, especially in motor control centres. Neanderthals had FOXP2 that was the same as in humans In songbirds, FOXP2 is associated with song learning  KE disorder: Mutation of FOXP2 which affects speech, mouth control and language. Twins  Identical Twins: Develop from a single (monozygotic) egg that splits into two. They are genetically identical. While they have the same genes, they may not have the same number of copies of these genes Some twins are in separate placentas as well which can account for health differences  Fraternal Twins: Develop from separate (dizygotic) eggs. Genetic risks and associations are studied in detail regarding twins  Separated Twins: Twins separated at birth, with the same genes, but raised in different environments. Subject of many studied regarding heredity vs. environmental influences. Studies of separated twins have shown remarkably similar life choices Separated fraternal twins are less similar then separated identical twins Adoption: Researchers study whether adopted children become more like their biological parents (genetics) or more like their environmenta
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