MZ twins share 100% of genes where DZ share 50%. In twin studies the researchers compare the degree of similarity for a particular trait i.e. Aggression. If MZ twins are more alike in terms of aggressiveness it means it is due to genetics.
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Adoption studies
can help determine the relative contributions of environment and heredity in aggression. Positive correlation between adopted children and their biological parents implies a genetic effect
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Adoption studies
while positive correlation between the child and their adopive parents implies an environmental effect.
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Research
A study of over 14,000 adoptions in Denmark found that a significantwith criminal convictions, demonstrating a genetic effect. number of adopted boys with criminal convictions had biological fathers with
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Miles and Carey
carried out a meta analysis of 24 adoption studies, results showed a strong genetic influence that accounted for as much as 50% of variance in aggression
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Gene for Aggression (MAOA)
MAOA regulates the metabolism of serotonin in the brain, and low levels of serotonin are linked to aggression. If MAOA isnt working properly serotonin levels drop and result in aggressive behaviour.
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Brunner et al
studied a Dutch family and found that the males behaved violently and found to b guilty of **** and arson. They were found to have low level of MAOA and a defect in the gene was identified.
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Front
Adoption studies
Back
can help determine the relative contributions of environment and heredity in aggression. Positive correlation between adopted children and their biological parents implies a genetic effect
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