Tandem repeats play a variety of roles in gene expression , regulation and evolution , and are ideal marker in genetic mapping . further more , the techniqe of dna fingerprinting based on the polymorphism of tandem repeat is now widely used in various fields such as medical jurisprudence , etc . the more eye - catching discovery is , in recent years , that some genetic diseases are related with certain trinucleotide repeats 串聯(lián)重復(fù)在基因表達(dá)、調(diào)控和遺傳等方面起著十分重要的作用,同時(shí)它因具有高度多態(tài)性,已成為基因組遺傳圖譜和物理圖譜的理想界標(biāo),另外以串聯(lián)重復(fù)為基礎(chǔ)的“ dna指紋技術(shù)”在法醫(yī)學(xué)等領(lǐng)域廣泛應(yīng)用。