In the molecular genetic technique of hybridization of DNA, single strands of DNA from two different species are allowed to join together to form hybrid double helices. Hybridization of DNA is accomplished by heating strands of DNA from two different species to 86° C. This breaks the hydrogen bonds between all complementary base pairs. The result is many single-stranded segments of DNA. The single-stranded DNA from both species is mixed together and allowed to slowly cool. Similar strands of DNA from both species will begin to chemically join together or re-anneal at complementary base pairs by reforming hydrogen bonds