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变异是指上下代之间或子代个体之间的差异。日常见到的变异可归纳成两大类。一类叫不遗传的变异;一类叫遗传的变异。不遗传的变异通常由一般环境条件引起,只表现在当代,下代如果环境条件正常,变异也就消失。例如由于养分缺乏,植株长得短小这种矮株并不遗传,第二年养分供应充
Variation refers to the difference between the descendants or between generations. Variants seen daily can be grouped into two broad categories. A class called non-genetic variation; a class called genetic variation. Non-genetic variation is usually caused by the general environmental conditions, only in the contemporary, next generation if the environmental conditions are normal, the mutation will disappear. For example, due to lack of nutrients, plants grow shorter this dwarf strain does not inherit the second year of nutrient supply