一、野生原始种菊花、海棠、牡丹等都是单瓣,花色单一,经过人工栽培繁殖后大多数变为重瓣花,而且花色绚丽多采,这是因为植物具有遗传和变异的属性。前者是说植物能够把亲代的性状,通过遗传基因传给后代;后者是说植物体具有因环境改变而改变了自身的遗传性的一种特性。长期以来,人们正是利用植物的这两种属性进行人工选育。由于生态环境 First, the wild primitive species of chrysanthemums, begonias, peonies and so is a single petal, single color, after artificial breeding most become double petal, and colorful gorgeous, it is because the plants have genetic and variation properties. The former means that plants can transmit their parents’ traits to their offspring through genetic genes. The latter means that plants have the property of changing their own heredity due to environmental changes. For a long time, people just use these two attributes of plants for artificial breeding. Due to the ecological environment