一、质量性状与数量性状生物的遗传性状按其变异的性质可以分为两类。一类是非连续的变异,相对性状之间界限分明,不易混淆,容易识别,可以明显地分组归类,例如,上一讲叙述的豌豆花朵的红色和白色、子粒圆形和皱形,水稻的红米和白米、非糯性和糯性,玉米种子的饱满和凹陷,这类性状不存在中间类型而表现为间断变异,故称为不连续变异,由于这类 First, the quality traits and the number of traits Biological characteristics of the genetic traits can be divided into two categories. One is the discontinuous variation, the boundaries between the relative traits are clear, not confused, easy to identify, and can be clearly grouped into groups, for example, the red and white of the pea flower described in the last lecture, round and wrinkle of the grain, Red rice and white rice, non-waxy and waxy, corn seed full and depression, these traits do not exist in the middle type and showed intermittent variation, it is called discontinuous mutation, because of this type