问题的提出 1981年春,我曾有机会到祖国各地对金鱼品种作了一些调查,结果发现在有些省市的动物园的金鱼展出廊中,在向群众作介绍的宣传栏里,大都这样写道:“金鱼品种形成的原因有二:(1) 是生活条件的改变;(2) 是人工选择。”这种观点是我国著名的遗传学家陈桢于1954年提出来的。好像这一问题已经解决了,现在为什么又提出来呢?因为我认为这种观点解释 PROBLEM PROBLEMS In the spring of 1981, I had the opportunity to conduct some surveys of goldfish species across the motherland and found that in the publicity bulletin boards for the goldfish in zoos of some provinces and municipalities, most of them wrote : “There are two reasons for the formation of goldfish breeds: (1) changes in living conditions; and (2) artificial selection.” This view was proposed by Chen Zhen, a famous geneticist in China, in 1954. It seems that this problem has been solved. Why is it raised now? Because I think this view is explained