题干

在西葫芦的皮色遗传中,已知黄皮基因(Y)对绿皮(y)显性,但在;另一白色基因(Ⅴ)存在时,则基因Y和y都不能表达。现有基因型ⅤⅴYy的个体自交,有关子代基因型与表现型的叙述,正确的是( )

A:有9种基因型,其中基因型为vⅴY_、Ⅴ_Y_的个体表现为白色

B:有9种基因型,其中基因型为Ⅴ_yy、vvyy的个体表现为绿色

C:有3种表现型,性状分离比为12:3:1

D:有四种表现型,性状分离比为9:3:3:1

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C

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