chromosome end染色体端chromosomen.染色体chromosome number variation染色体数目变异Chromosome aberration ratio染色体畸变率Chromosome configu-ration染色体构型chromosome handingtechnique染色体分带术chromosome structural change染色体的结构改变chromosome non-disjunction染色体不分离chromosome modification site染色体修饰位点chromosome deletion syndrome染色体消失之徵候chromosome sorting technique染色体分类分离技术chromosome banding technique染色体分带技术