A new study involving more than three thousand adult twins from Australia has investigated the contributions of genetic and environmental factors to blacking and passing out after drinking. Twins are an important resource for health research, including alcohol studies. By comparing the frequency of an outcome ─ such as blackout ─ among pairs of identical twins (who share all their genes) and non-identical twins (who share only half of their genes but many aspects of their environment), researchers can better understand the roles of genetic and enviromental factors in influencing the outcome.
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