某种鼠中，毛的黄色基因Y对灰色基因y为显性，短尾基因T对长尾

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更新 2022-09-03
科目生物
题型选择题
难度中等
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某种鼠中，毛的黄色基因Y对灰色基因y为显性，短尾基因T对长尾基因t为显性，且基因Y或T在纯合时都能使胚胎致死，这两对基因是自由组合的。现有两只黄色短尾鼠交配，它们所生后代的表现型比例为

A．9:3:3:1

B．1:1:1:1

C．3:3:1:1

D．4:2:2:1

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