豌豆种子黄子叶(Y)对绿子叶(y)为显性,圆粒(R)对皱粒(r)

豌豆种子黄子叶(Y)对绿子叶(y)为显性,圆粒(R)对皱粒(r)为显性,有人用黄色圆粒和绿色圆粒进行杂交,发现后代出现4种表现型,对性状进行统计后结果如下:圆粒:皱粒=3:1;黄色:绿色=1:1。请回答问题:

(1)亲本的基因型为:黄色圆粒         ,绿色圆粒          

(2)在杂交F1代中,非亲本表现型的概率为      ,其中纯合体的基因型为        

(3)F1代中黄色圆粒的基因型为            

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