"一不同"是指不同表现形式。如羊的白毛和猪的黑毛、豌豆的白花和绿叶均不属于相对性状。
(2)杂交后代中同时出现显性性状和隐性性状的现象不一定属于性状分离。如"紫花×紫花→紫花、白花"属于性状分离,而"紫花×白花→紫花、白花"则不属于性状分离。
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