<P> Taking a genealogical DNA test requires the submission of a DNA sample . The most common way to collect a DNA sample, which can be done by either visiting a DNA test clinic or by ordering a home test through an independent DNA test supplier, is by a cheek - scraping (also known as a buccal swab). Other methods include spit - cups, mouthwash, and chewing gum . After collection, the sample is mailed to a testing lab . </P> <P> There are three major types of genealogical DNA tests: Autosomal and X-DNA, Y - DNA and mtDNA . </P> <Ul> <Li> Autosomal tests look at chromosomes 1--22 and X . The autosomes (chromosomes 1--22) are inherited from both parents and all recent ancestors . The X-chromosome follows a special inheritance pattern . Ethnicity estimates are often included with this sort of testing . </Li> <Li> Y - DNA looks at the Y - chromosome, which is inherited father to son, and so can only be taken by males to explore their direct paternal line . </Li> <Li> mtDNA looks at the mitochondria, which is inherited from mother to child and so can be used to explore one's direct maternal line . </Li> </Ul> <Li> Autosomal tests look at chromosomes 1--22 and X . The autosomes (chromosomes 1--22) are inherited from both parents and all recent ancestors . The X-chromosome follows a special inheritance pattern . Ethnicity estimates are often included with this sort of testing . </Li>

What is the difference between y-dna and mtdna
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