互補(bǔ)的核苷酸的相互作用。由于DNA是一種通過互補(bǔ)作用形成的雙鏈結(jié)構(gòu)（C和G，A和T），當(dāng)互補(bǔ)鏈被打斷時就會發(fā)生重新相互連接或雜交。若有相配的堿基序列，這種情況會發(fā)生在DNA和RNA鏈之間。雜交可以發(fā)生在包括復(fù)制、轉(zhuǎn)錄在內(nèi)的所有DNA反應(yīng)中，是Southern和Northern,PCR以及測序的分子生物學(xué)基礎(chǔ)。

The interaction of complementary nucleic acid strands. Since DNA is a double-stranded structure held together by complementary interactions (in which C always binds to G, and A to T), complementary strands favorably reanneal or “hybridize” to each other when separated. This can occur between two DNA strands and also between DNA and RNA strands provided there is sufficient complementarity in their base sequence. Hybridization occurs in all physiological DNA reactions including replication, and transcription, and forms the basis of many molecular biology techniques including Southern and Northern blotting, PCR and sequencing.