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【简答题】
在人类中，惯用左手和惯用右手是一对相对性状，由等位基因R和r控制．一对惯用右手的夫妇，生了一个惯用左手的子女． 试分析与探究： （1）左撇基因和右撇基因哪个是显性基因？为什么？______ （2）该家庭中，子女的基因型为______，父母的基因型分别为______． （3）若该夫妇再生一个子女，请预测未来子女的基因型和表现型． 基因型：______ 表现型：______．
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