I have often wondered, why won’t identical twins have same intelligence levels? Since they share almost everything else?
Well, to my own understanding of this thing, every genetic trait is carried on an allele(a pair of genes) and these genes combine indepently of each meaning that; the inheritance of the same physical features does not mean the inheritance of the same cognitive features. The genes that combined to form their identical face is different from the one that combines to form their cognitive and nervous systems. That’s why we can find identical twins who do not behave exactly same way even though they have grown up the same way and at the same place