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在进行的许多遗传研究工作中,通常可以从有机体获得一种非整倍体类型——三体(trisomicl),即原是成对的染色体现有三个成员,为三体染色体(trisome)。初级三体染色体公式为2n+1。多数三体的来源与单体相同。细胞减数分裂过程的观察表明:其细胞学行为是后期Ⅰ染色体的不规则分配。在细胞遗传学和育种学等学科中,对三体类型的遗传分析已成为一种重要手段,逐渐地应用到其研究领域中。通过这种非整倍体(aneuploid)技术的应用,可以间接进行许多有实用价值的工作,用以测定基因所
In many of the genetic studies conducted, it is often possible to obtain from the organism an aneuploidy type, trisomicl, that is, the three paired chromosomes are trisomes. The primary trisomy chromosome formula is 2n + 1. The source of most trisomies is the same as the monomer. Observation of cell meiosis process showed that the cytological behavior was irregular distribution of late chromosome Ⅰ. Among the disciplines such as cytogenetics and breeding, the genetic analysis of trisomy has become an important method gradually applied to its research field. Through the use of this aneuploid technique, there are many indirect, valuable work that can be done to determine the genetic