在培育菌种过程中,常常会遇到这样一些问题。譬如,为什么纯种的后代会变“杂”,甚至出现劣种?为什么不同菌株杂交有可能获得优种?为什么有些性状总是形影不离,难以去劣存优?这些都涉及到遗传规律。弄清这些道理,就会有目的地去改造菌种。下边介绍遗传的三大定律和一条法则。 In the breeding process, often encounter some problems. Why, for example, why purebred offspring will become “miscellaneous” and even worse off? Why is it possible to obtain superior crossbreeds for different strains? Why are some of the traits always precarious and difficult to survive? These involve genetic laws. Clear these truths, there will be a purpose to transform bacteria. The following describes the three major laws of inheritance and a law.