![]() Harry was raised by muggles after the death of his magical parents, James and Lily Potter, before his first birthday although James and Lily were outstanding wizards, exemplified by their role as head boy and head girl at Hogwarts school, the environment of 4 Privet Drive where Harry lived with his muggle relatives, the Dursley family, could not have been further removed from the magical world.This situation would be similar to an adoption study, the most powerful way of disentangling genetic influences from those of the environment. Magical ability also seems to be genetically determined, with familial aggregation highlighted by the Weasley twins who seem equally matched in aptitude, and the magical abilities of Harry Potter. Magic is not a dichotomous trait we prefer the idea of magical ability, a quantitative attribute, ranging from the talents of Albus Dumbledore, Harry’s headmaster at Hogwarts School of Witchcraft and Wizardry, to the relative ineptitude of Crabbe and Goyle, the sidekicks of Harry’s nemesis Draco Malfoy. ![]() Finally, parent of origin effects are not apparent-examples exist of wizards with muggle father and wizard mother parentage and vice versa. Thirdly, matings between muggles produce either muggles or, rarely, offspring with magical abilities and never squibs. Secondly, matings between humans with magical abilities and muggles seem to always produce offspring with magical abilities. Firstly, matings between humans with magical abilities produce offspring with magical abilities, rarely squibs, and not muggles. When considering the genetics of magic we need to be able to explain several observations. Compared with muggles squibs have some magical ability, as they can see and interact with the magical world. ![]() Rarely we are introduced to squibs, offspring resulting from the non-transmission of magic within a family with magical abilities. According to the Harry Potter books 5, 6, 7, 8, 9, 10, 11 most people in the world are muggles-that is, possess no magical ability-whereas a minority are witches and wizards with magical abilities. ![]()
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