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In the most basic terms, genome is the genetic material of an organism. It is what tells the organism what to be and how to be. The genome is coded in DNA, or in RNA for many types of viruses. The term, genome, was coined in the 1920, as a portmanteau of gene and chromosome.
In modern molecular biology and genetics, the genome is the genetic material of an organism. It consists of DNA (or RNA in RNA viruses). The genome includes both the genes and the non-coding sequences of the DNA/RNA.rotein-coding genes and RNA-coding genes are generally non-repetitive DNA. Bigger genome does not mean more genes, and the proportion of non-repetitive DNA decreases along with the increase of genome size in higher eukaryotes.