Base pair

From ISOGG Wiki
Jump to: navigation, search
This page contains changes which are not marked for translation.

Other languages:English 100% • ‎French 100%
Base pair.jpg

Public domain logo This image is taken from the Talking Glossary of Genetic Terms and is reproduced courtesy of the National Human Genome Research Institute.


A base pair is two chemical bases bonded to one another forming a "rung of the DNA ladder". The DNA molecule consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases - adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.

Further reading

Public domain logo This article uses material in the public domain from the Talking Glossary of Genetic Terms and is reproduced courtesy of the National Human Genome Research Institute.