题目：
在一对相对性状的遗传中，纯合隐性亲本与杂合体亲本交配，其子代个体中与双亲基因型都不同的是[ ]
A．75%
B．25%
C．50%
D．0%
答案：
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在一对相对性状的遗传中，纯合隐性亲本与杂合体亲本交配，其子代个体中与双亲基因型都
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