下列属于遗传现象的是 ①父亲单眼皮儿子也是单眼皮 ②一猪生九仔连母十个样③一树结果酸甜各异 ④龙生龙凤生凤．a．①②b．②③c

下列属于遗传现象的是 ①父亲单眼皮儿子也是单眼皮 ②一猪生九仔连母十个样③一树结果酸甜各异 ④龙生龙凤生凤．a．①②b．②③c
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