Twin studies monozygotic twins dizygotic twins if

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TWIN STUDIES MONOZYGOTIC TWINS DIZYGOTIC TWINS IF GENETICS PLAY A KEY ROLE, MZ’S SHOULD HAVE MORE BEHAVIORAL SIMILARITY THAN DZ’S Look at identical twins raised in two different environments
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RESEARCH GENERALLY SUPPORTS THIS BUT WHAT IS THE PROBLEM WITH SUCH STUDIES? ROLE OF ENVIRONMENT –MZ’S MAY BE TREATED MORE ALIKE THAN DZ’S BECAUSE OF SIMILARITY IN APPEARANCE. DRESSED ALIKE ETC. THEREFORE, SHARED ENVIRONMENT. IDEAL WAY IS TO EXAMINE MZ’S WHO ARE REARED APART/NON-SHARED ENVIRONMENT. OBVIOUSLY DIFFICULT TO DO. BOUCHARD ET AL (1990) –100 PAIRS –MINNESOTA STUDY OF IDENTICAL TWINS REARED APART BOUCHARD ET AL (1990) FOUND THAT AGGRESSION, SELF CONTROL AND NEGATIVE EMOTIONALITY WERE HIGHLY HERITABLE TO DATE WE HAVE LITTLE INFORMATION ON GENOTYPES TO EXAMINE THEIR LINK TO CRIMINAL BEHAVIOR FEW DATA SETS ON CRIME INCLUDE GENETIC DATA, ALTHOUGH THERE HAVE BEEN SOME ATTEMPTS TO DO SO. PEOPLE LIKE DR. CHRIS GIBSON AND DR. KEVIN BEAVER HAVE BEEN WORKING IN THIS AREA Neuropsychological deficits on genes-DRD4 and DRD2 and neighborhood factors EXTREMELY IMPORTANT TO UNDERSTAND THAT THE APPROPRIATE WAY OF THINKING ABOUT THE INFLUENCE OF GENETICS IS TO THINK IN TERMS OF THE GENE x ENVIRONMENT INTERACTIONS This refers to the hypothesis that exposure to certain environments will bring out the genetic tendency FOR EXAMPLE, IF THERE IS A GENE THAT INCREASES THE LIKELIHOOD THAT AN INDIVIDUAL WILL BECOME AN ALCOHOLIC IT MAY MANIFEST ITSELF DIFFERENTLY IN DIFFERENT ENVIRONMENTS If one individual is raised in a environment that abstains from drinking--VERY LITTLE LIKELIHOOD OF ALCOHOLISM On the other hand, if another individual is raised in an environment conducive of drinking--HIGH LIKELIHOOD OF ALCOHOLISM. Policy Implication Isolate, sterilize, or execute offenders Brain surgery Chemical treatment Better diets Better health care for mother and child
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