Most people are right-handed and children usually have the same handedness as their parents. This suggests that genes are at work. But identical twins have identical genes, so genes cannot be the whole story. Cultural attitudes seem to have played an important part in the development of hand preferences. In the past, left-handed have suffered anything from teasing to flogging. Even today in some countries en forced right-handedness, particularly for writing and eating, is still common.
To explain the observed patterns of handedness, researchers have devised what is known as a’ geneculture coevolution’ model. The initial assumption of the model-drawn from observation of non-human primates and other mammals such as mice-is that early on in human evolution, the genetic make-up of individuals inclined them to prefer one hand or the other, but that the population was equally divided between right and left-handed people. Over time, according to the model, the intera
A. handedness is solely determined by genes
B. handedness is solely determined by culture
C. handedness is determined by both genes and culture
D. handedness may be determined by factors other than genes and culture
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{{B}}What to Do When the Patient Says, ’Please Don’t Tell Mom’{{/B}} Some years ago, in the candor (坦白) of the exam room, a seventh-grade boy told me that he didn’t really have friends at school, and that he sometimes found himself being picked on. I gave’ him the pediatric (儿科的) line on bullying: it shouldn’t be tolerated, and there are things schools can do about it. Let’s talk to your parents, let’s have your parents talk to the school. And he was horrified. He shook his head and asked me please not to interfere, and above all not to say a word to his mother, who was out in the waiting room because I had asked her to give us some privacy. He wouldn’t have told me this at all, he said, except he thought our conversation was private. The situation at school wasn’t all that bad; he could handle it. He 我来回答: 提交
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