抗性的表达可能受到一些修饰基因的影响，或者在同一基因位点上存在抗性程度不同的复等位基因。
Resistance expression might be affected by some modifier genes, or there might be multiple alleles with different level of resistance on the same locus.
这些是受复等位基因或含分离等位基因的位点支配的，上位性也可能靠它而起了作用。
These were controlled by multiple allels or by loci with allels that segregate independently whereby epistasis also may have played a role.
芸苔属植物自交不亲和性受单一位点的复等位基因控制，此位点命名为S位点。
Self_incompatibility in Brassica is controlled by a single multiallelic locus (designated as S locus) that is responsible for pollen recognition on the stigma surface.
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