The main component of a chromosome is deoxribonucleic acid(DNA).It is usually a double strand spiral structure of poly nucleotides. One strand is complementary to the other. In it there are 5 carbon sugars, nitrogen bases(adenine, guanine, cytosine, thymine) and in organic phosphate.




These three components are collectively called nucleotide.DNA is a stable substance in a chromosome. Nitrogen bases are of 2 types ;a purine and a pyrimidine. Adenine and Guanine are of purine. Cytosine and Thymine are of pyrimidine. The bond is always developed Between a purine and a pyrimidine. So, a strand of DNA is complementary to another Strand...