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Your Friend Alex and Katya Are Concerned That Their 9-Month-Old

question 62

Essay

Your friend Alex and Katya are concerned that their 9-month-old daughter Mariana often uses her left hand to pick up objects. Alex and Katya are both right-handed, and they do not want Mariana to be left-handed because it is a right-handed world. What can you tell your friends about the roles of heredity and environment in the development of hand preference?


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