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15问答网 > 基因型2⼀3Aa自交后代基因型的概率求法，比如后代Aa的概率，是2⼀3×2⼀3×1⼀2，

基因型2⼀3Aa自交后代基因型的概率求法，比如后代Aa的概率，是2⼀3×2⼀3×1⼀2，

还是2/3×1/2。

2025-03-16 11:03:51

推荐回答（1个）

回答1：

因为是自交，所以一旦知道基因型Aa，另一与其交配的个体基因型一定是Aa，故后代出现Aa的概率是2/3×1/2；
若为自由交配，杂交个体之一为Aa时，另一个体可为AA、Aa、aa，是不确定的，所以要求两个基因型都是Aa时后代是Aa的概率则为 2/3×2/3×1/2

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