GENETICS, DNA
DNA, deoxyribonucleic acid, is composed of two long chains of molecules. Each chain contains deoxyribose in alternation with phosphoric acid connected to four nucleotides: adenine, thymine, cytosine, guanine. The two chains wind around each other forming a double helix, the backbone of the chromosomes. Successive segments of the DNA molecule form genes which carry the hereditary information transmitted from generation to generation. Schematic representation of the DNA helix.
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Photo credit: © VERONIQUE ESTIOT / BSIP / Alamy / Afripics
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