Aristotle’s grasp of the facts of inheritance is only slightly more sophisticated than the musings of any newly minted father: Some children resemble their parents, others do not. Some resemble their fathers, others their mothers, some in the whole body, some in each individual part, some their parents, some their ancestors, some just a general person. Males may resemble the father, females the mother. Some, though, resemble no relative but do resemble a human being. Some do not even resemble a human being in form but, actually, a monster. Mendelian ratios are not even a distant dream.