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Twin Studies
Twin studies

Studying twins offers a unique opportunity to identify and differentiate physical and behavioral characteristics according to their origin. How much of who we are is genetically determined and how much is the result of our environment? By comparing the consistency of phenotypes, that is, observable physical and behavioral characteristics, in twins we can hypothesize about their heritability-whether or not a specific characteristic is genetically determined. Based on the assumption that all twins share their environment and that monozygotic twins also share genomes, phenotypes that vary between monozygotic twins must be the result of environmental factors, while those that are consistently the same must be genetic in origin.

Though they must be inextricably linked, there is a difference between research on twins and research ...

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