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如何判定两对基因在同源染色体上还是非同源染色体上

2025-03-17 02:20:29

推荐回答（1个）

回答1：

设两对Aa、Bb
用显性纯合和隐性纯合作亲本AABBxaabb得F1,然后让F1自交,如果F2代出现4种性状,且比例为9：3：3：1则两对基因在非同源染色体上,如果只出现两种性状双显性与双隐性（比例3:1）就是在同源染色体上.
两对基因在非同源染色体上这个,就是课本上的实验了.
如果在同源染色体上,那么就可以看成是是一对基因,不论是亲代还是F1代,他们产生的配子都是只有AB和ab（绑在同一条染色体上无法自由组合）,实验过程就可以看做,DDxdd,然后F1自交,结果当然是显性比隐性3:1啦!

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