题目

阅读下面的短文，然后按照要求写一篇150词左右的英语短文。 My wife, daughter, and I moved into our home nine years ago. We called the area in front of our house “rock graden” as it is full of rocks. Last summer I found a tiny little plant which I could not immediately identify at the end of the rock garden. I knew I didn’t plant it and my wife claimed that she didn’t either. We decided to let it continue growing until we could figure out what it was. Weeks passed and as I made my way back to the mystery plant, it appeared to be a sunflower. It was spindly with a 已知惯用右手和惯用左手是一对相对性状，且控制该性状的基因位于常染色体上。某生物兴趣小组对小王及其家人进行了调查，其结果如下： 请据图回答下列问题：（1）判断性状的显隐性：______为显性。 （2）若显性基因用R表示，隐性基因用r表示，请写出该同学的母亲和姑姑的基因型：母亲：____，姑姑：_______。 （3）若小王的父母再生一个孩子，则该孩子是惯用左手的几率是___。