The DNA Chinese name is the deoxyribonucleic acid, also called the deacidizing ribonucleic acid (RNA), (DNA, for English Deoxyribonucleic acid abbreviation), is the chromosome main chemical composition, simultaneously also is composes the gene the material.Sometimes is called “the heredity particle”, because in the multiplicative process, the father generation transmits they DNA part of duplications in the filial generation, thus completes the character the dissemination.

Strict saying, DNA is grapevine such coils around mutually by two Shan Lianxiang the geminate helix, divides into A DNA, B DNA and Z DNA differently according to the screw, the double helix which the James · watson and Buddha bright west Si · Krick discovered, is called B water union DNA, is most common in the cell.

This kind of nucleic acid high polymer is a sequence which links by the nucleotide, each nucleotide all by member ribodesose, molecular phosphoric acid as well as a molecular basic group is composed.DNA has four kind of different nucleotide structures, they are the adenine (adenine, abbreviation are A), the thymine (thymine, abbreviation is T), the cytosine (cytosine, abbreviation is C) and the guanine (guanine, the abbreviation is G