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Genomic deoxyribonucleic acid (abbreviated as gDNA [1]) is chromosomal DNA, in contrast to extra-chromosomal DNAs like plasmids.Most organisms have the same genomic DNA in every cell; however, only certain genes are active in each cell to allow for cell function and differentiation within the body.
Genomics is an interdisciplinary field of molecular biology focusing on the structure, function, evolution, mapping, and editing of genomes.A genome is an organism's complete set of DNA, including all of its genes as well as its hierarchical, three-dimensional structural configuration.
Genome size is the total number of the DNA base pairs in one copy of a haploid genome. Genome size varies widely across species. Genome size varies widely across species. Invertebrates have small genomes, this is also correlated to a small number of transposable elements.
The total amount of coding DNA is about 1-2% of the genome. [18] [16] Many people divide the genome into coding and non-coding DNA based on the idea that coding DNA is the most important functional component of the genome. About 98-99% of the human genome is non-coding DNA.
Genomic DNA is tightly and orderly packed in the process called DNA condensation, to fit the small available volumes of the cell. In eukaryotes, DNA is located in the cell nucleus, with small amounts in mitochondria and chloroplasts.
A genomic library is a collection of overlapping DNA fragments that together make up the total genomic DNA of a single organism. The DNA is stored in a population of identical vectors , each containing a different insert of DNA.