The Origin of a Human •Chromosome –The whole strand of hereditary material •___ in total (__ from mommy, ___ from daddy). •Genes –Sections of the strand that control chemical reactions –Instructions for growth Genes: “Create a pair of organs for sensing light patterns. Here are some instructions on how to do that.”
The Origin of a Human •Simplicity –The EITHER/OR dichotomy makes behavior easy to explain •________ –It answers whether we were supposedto be a certain way •Justification –It justifies our actions
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Complicated Expressions •Sex –Determined by ____ ___________ (Xand Y) •Two X’s and mammals are female•One X and Y and they are male –Remember, genes are NOT chromosomes •Think of them as instructions that can be either LOUD or relatively quiet