More times than not, these studies supporting genetics and personality/behavior on performed on twins as a measure of hereditability (Kandler et al., 2016). In the case of identical twins, the subjects are formed from one egg and the same sperm cell. One study with the two identical twins named “Jim” show the effects genetics has on personality development. These twins were separated shortly after birth, had similar interests, been married twice to women bearing the same name, suffered from chronic headaches, and lived only a short distance away from each other. While these results are astounding in this study, they are highlighted by two siblings with the exact same genetic makeup growing up in different, but similar environments. These twins are the minority of the population, an extremely small sample that could even be called outliers. For example, if one of these twins had been taken overseas or even a different region of the United States, cultural differences/environment would have most definitely shaped personality and behavior. Genetics obviously play a role in personality, however, besides the sibling affect, genetics in social development are a bit overrated. Simple science proves that with every generation, genes become diluted. This is true with genes coding for appearance, i.e. blonde hair and blue eyes, and those coding for personality traits. A common phrase used to describe a child’s behavior is, “he is just like his father” or “she is going to grow up to be like her mother” and while genetics do play a factor in behavior, many forget an important aspect of development, the parents. Of course, many children will grow up to be like their parents because they were environmentally exposed to them for an extended period. This goes back to the social learning theory explaining how children learn