一个选择题~~~~~~~~~~~~~~~~~~~~~~~~~~~在线等
推荐回答(5个)
假设控制这个相对性状的基因是A和a
A.75%黑色,25%白色
这个情况是Aa和Aa杂交
B.只有黑色或只有白色
AA和Aa杂交
那么后代的性状都是A控制的
那么这个时候如果A是黑的,那就全是黑的
如果A是白的,那就全是白的了
C.有些黑色,有些白色
Aa和Aa杂交
这个也可以来说明这个现象是存在的
他们杂交出来包括AA,Aa ,aa
所以两钟颜色都有
希望你看的明白
是D
他可能生黑色可能白色
B的话如果他生2只黑色2只白色为什么不可以?
或者基因突变,生其他颜色也是有可能的。。
选D 若两只豚鼠是Aa Aa 则为A选项 若2老鼠是AA Aa 则为B选项
A、C选项差不多
没说那两只豚鼠的基因组成 所以选D了
同意LS,不过题中说“两只杂合黑色豚鼠”,所以两只豚鼠是Aa Aa,当然如果考虑基因突变等因素,则选D
这道题有点问题 说什么都可以对 你看过高中课本里有这么个情况吗 一个受精卵被一刀切看 发育的后代理论上是一样的 可是课本上的图是不一样的
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