Hello, I have some question I want to ask. 1) Lets say there identical twins marry identical twins, and they have baby's would the baby's of the two families share the same DNA as if they were brothers? If someone didn't understand I mean: male and female which have identical brother or sister give birth to a baby, and their brother and sister also produce an offspring, will those two offspring’s have the DNA closeness of brothers or sisters? Skin Color From what I understand is that when the homo sapien migrated from Africa to Europe he had no need for high melanin level. (I am almost sure this is not true). So basically the question is lets say a group of people (2000) With black skin color come to a country such as Norway and not be mixing with the general population, will after a couple of hundreds of years their offspring’s have very lighter skin color? If I am wrong then, how come there are many different skin colors in the world?