The Biological Approach:>Assumptions (everything psychological is first biological)The neurochemical basis of Behaviour- chemicals transmission in the brain by neurotransmitters- imbalance of chemicals cab be cause of mental illnesses- dopamin = schizophrenia- serotonin = OCDThe genetic bases of Behaviour- twin study (mono/di zygotes) % concordance rates which is the extent go which the twins share the same characteristics.Geno/ Phenotypes- Geno= genes that determination certain characteristics, Pheno= environmental + genes that influence certain characteristics.Evolution & Behaviour- natural selection (genetically determined behaviour for survival- provide advantages)

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