DNA Defined

Deoxyribonucleic Acid | dē ˌen ˈā

Francis Crick, James Watson, Maurice Wilkins

  Deoxyribonucleic acid, a self-replicating material which is present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.

DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.

Nearly every cell in a person's body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA).

Watch the animated video on the basics of DNA, genes, and heredity.


DNA Testing

There are three DNA testing types

  Three principal types of genealogical DNA tests are available, with each looking at a different part of the genome and useful for different types of genealogical research: autosomal, mitochondrial (mtDNA), and Y-DNA. Autosomal tests may result in a large amount of DNA matches (other test persons that the individual may be related to), along mixed male and female lines, each match with an estimated distance in the family tree. However, due to the random nature of the estimated distance, secure conclusions can only be made a small number of generations back. Autosomal tests are also used in estimating ethnic mix.

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DNA Testing Accuarcy

How Accurate Are Online DNA Tests?

  When it comes to ancestry, DNA is very good at determining close family relations such as siblings or parents, and dozens of stories are emerging that reunite or identify lost close family members (or indeed criminals).

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DNA Testing Cost

Best DNA Testing of 2019

  Before you decide which DNA testing service is best for you, learn about the available options & compare the top-rated providers on the market.

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DNA News

Latest DNA News

Israeli Scientists Claim ‘Complete Cure For Cancer' One Year Away

James P. Allison EM1B5525 (46207775441)

Jame Allison is an American immunologist and Nobel laureate who holds the position of professor and chair of immunology and executive director of immunotherapy platform at the MD Anderson Cancer Center at the University of Texas.

Tasuku Honjo 201311

Tasuku Honjo is a Japanese immunologist, and Nobel laureate best known for his identification of programmed cell death protein 1. He is also known for his molecular identification of cytokines: IL-4 and IL-5,[3] as well as the discovery of activation-induced cytidine deaminase (AID) that is essential for class switch recombination and somatic hypermutation.

The Nobel Prize in Physiology or Medicine 2018 was awarded jointly to James P. Allison and Tasuku Honjo for their discovery of cancer therapy by inhibition of negative immune regulation.