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which one s which? i m pam. i m pauline. identical twins share all their genes having split from a single fertilised egg in the first two weeks after conception. fraternal twins share half their genes on average. they result when a women releases to eggs at the same time and they are fertilised by two separate sperm, so they have 50% of their genes in common on average, like ordinary siblings. comparing resemblance in identical twins to fraternal twins, gives us a handle on whether or not genetics has an effect. it would, if identical twins were more alike than fraternals, and they invariably are. for decades, they have been the focus of scientific research. the study in new york came to light when identical triplets who were separated at birth accidentally discovered each other. studying twins gives us enormous insight into how we come to be the way that we are. twin studies are a natural model. looking at genetic and environmental influence on behaviour and what we re finding is that

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