It is proven that this is due to those genes. But then education also plays a role in this because they were raised by different families, they learned different things and one might have learned one thing and the other might have learned another thing from that family, but then they learned what the other has learned. In a 1990 study it was found that genetics accounts for 50 percent of the religiosity of each population. A 1986 study in Minnesota found that genetics plays a larger role in personality than previously thought. According to nature and nurture: twin study on YouTube, shows how when twins are born how similar they are when they are born. This shows that when you have an identical twin you want differences because they learn that they don't want to be the same. You can see starting from the womb that on the nature side you can already see the difference because one of the twins in the womb usually receives more nutrients than the other, which is seen when they are born and one is much smaller than the other. When testing twins, research shows that their IQs are different at first. Then, after taking the IQ test a few times, they started to get up and get closer to the same