性状的变异有连续的变异和不连续的变异。如:树冠的浓密与稀疏,树枝的粗、细,叶面白粉或毛的有无,种壳的斑点或毛的有无等,这些成对的性状,不易受环境条件的影响发生变异,彼此差别明显,不易混淆,一般没有中间类型,即使由于显性不完全,出现中间类型,仍然可以把它们区分归类,这种具有明显界限的不连续变异的性状叫质量性状。质量性状的区别,可以用文字直接描述。许多经济性状,如:树高,粗度,材积,含油量,种子产 Trait variation has continuous variation and discontinuous variation. Such as: canopy dense and sparse, the branches of crude, fine, foliar white flour or hair, the seed coat of the spots or the presence of hair, these pairs of traits, not easily affected by environmental conditions change, each other The difference is obvious and not easy to be confused. There is usually no intermediate type, and even if the intermediate type appears due to the explicit imperfection, they can still be classified. The trait with discontinuous variation with obvious boundaries is called the quality trait. The difference between the quality of traits, you can use words to describe directly. Many economic traits, such as: tree height, thickness, volume, oil content, seed production