1The human genome is all genes put together. The current estimate of the number of genes in the human genome is 25,000. The human genome contains a total of approximately 3 billion DNA base pairs which contain those 25,000 genes.DNA is made up of four similar chemicals (called bases and abbreviated A, T, C, and G) that are repeated millions or billions of times throughout a genome. The particular order of As, Ts, Cs, and Gs is extremely important. The order underlies all of life's diversity, even dictating whether an organism is human or another species such as yeast, rice, or fruit fly, all of which have their own genomes and are themselves the focus of genome projects. Because all organisms are related through similarities in DNA sequences, insights gained from nonhuman genomes often lead to new knowledge about human biology. This was stated in 2000 by The Human Genome Project. The Human Genome Project produced a reference sequence of the euchromatic human genome, which is used worldwide in biomedical
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