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生物科学研究的进展或突破，在很大程度上取决于先进的研究手段和得心应手的实验材料。例如，研究个别基因的效应，利用近等基因系；明确个别染色体的效应，借助于染色体代换系。染色体代换是一个物种或品种的个别染色体代换另一个物种或品种相应染色体所产生的品系。如果...
Progress or breakthroughs in bioscience research depend to a large extent on advanced research tools and handy experimental materials. For example, studying the effects of individual genes using near-isogenic lines; clarifying the effects of individual chromosomes with the aid of chromosomal substitutions. Chromosomal substitution is the substitution of an individual chromosome of one species or species for the strain produced by the chromosome of the other species or species. in case...