A megabase (Mb) is a unit of length for DNA fragments, equal to 1 million nucleotides. Deoxyribonucleic acid ( DNA) is a Nucleic acid that contains the genetic instructions used in the development and functioning of all known Nucleotides are Organic compounds that consist of three joined structures a nitrogenous base a Sugar, and a Phosphate group In the human genome, one megabase is roughly equivalent to one centimorgan (cM) or 1 million base pairs (bps). The human genome is the Genome of Homo sapiens, which is stored on 23 chromosome pairs In Genetics, a centimorgan (abbreviated cM) or map unit (mu is a unit of Recombinant frequency for measuring Genetic linkage. In Molecular biology, two Nucleotides on opposite complementary DNA or RNA strands that are connected via Hydrogen bonds are called