allelen.等位基因allele exclusion等位基因排斥Allele variation等位变异allele frequency等位基因频率allele-specific等位基因特异性allele diminution基因降率allele replacement等位基因取代allele special PCR等位基因特异聚合酶链反应allele specificity等位基因专一性allele frequencies等位基因频率Allele polymorphism等位基因多态性