By comparing the arrangement and distribution of the peaks, it is possible to compare profiles of known origin with a profile from a crime sample. If the two profiles match, databases are used to estimate the probability of obtaining a matching profile from a person selected at random; this is referred to as thematchprobability. Closely related individuals are more likely to share DNA profiles than more distantly related individuals.
mtDNA Tests: These type of tests look at the DNA found in our cell’s mitochondria. Mitochondria is located in the cytoplasm of the cell (surrounding and separate from the nucleus where most DNA is found) and is therefore only inherited from your mother. This means that a mtDNA test can help you understand the ancestry of your maternal line only. The nature of this test option also limits it to the understanding of deep ancestry (not so helpful for genealogists)–although the more detailed the test, the more accurate and specific your results become. The most commonly used tests for this purpose can be found through Family Tree DNA (FTDNA) and they have a huge amount of helpful information on better understanding the science and genealogical significance of this method of genetic testing.