resulting bond that would create. identical twins share all their genes having split from a single fertilised egg in the first two weeks after conception. fraternal twins share have the genes on average. the result when a women releases to exert the same time and they are fertilised by two separate spurn so they have 50% of their genes in common on average like ordinary siblings. compare a resemblance in identical twins to fraternal twins, gives a handle on whether or not genetics has an effect. it would have identical twins were more alike and they invariably are. for twins were more alike and they invariably are.— twins were more alike and they invariably are. for decades, they have been _ invariably are. for decades, they have been the _ invariably are. for decades, they have been the focus _ invariably are. for decades, they have been the focus of— invariably are. for decades, they have been the focus of scientific| have been the focus of scientific research. the study came to light when identical triplets separated at birth accidentally discovered each other. it birth accidentally discovered each other. , , ., ., , birth accidentally discovered each other. , , ., , other. it gives us enormous insight into how we _ other. it gives us enormous insight into how we come _ other. it gives us enormous insight into how we come to _ other. it gives us enormous insight into how we come to be _