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Biological Approach - Genetics and Behaviour - Coggle Diagram
Biological Approach - Genetics and Behaviour
GENES
5-HTT
Caspi et al (2003)
GENETIC SIMILIARITIES
Kinship studies
Weissman et al (2005)
- depression
Twin studies
Monozygotic twins
fraternal twins; they develop from two different fertilized eggs.
Dizygotic twin
fraternal twins; they develop from two different fertilized eggs.
Researchers compare behavioral traits of monozygotic (MZ or identical) twins and dizygotic (DZ or fraternal) twins to evaluate the degree of genetic and environmental influence on a specific trait.
Human Genome Project
Adoption studies
Researchers investigate similarities between the adoptee and their biological and adoptive parents. Similarity with the biological parent is potentially the result of genetic inheritance, while similarity with the adoptive parent is more likely the result of environmental factors.
OCD:
Nestadt et al (2000)
Eating disorders:
Lilienfield et al (1998)
EVOLUTIONARY EXPLANATIONS
Depression
Obesity
Violence
Sexuality