DNA testing has become very popular and demand for these tests has been increasing dramatically over the last couple of years and there are no signs of a slow down anytime soon. I know that many people want to take a genealogy DNA test but are not sure which company to use. This post will try to summarize the options available.
Everyone’s DNA is made up of 23 pairs of chromosomes. 22 of these are known as autosomal chromosomes inherited from both parents and the 23rd are the sex chromosomes. Males have an X and a Y sex chromosome with the Y chromosome inherited from the father and the X chromosome from the mother. Women have two X sex chromosomes, one each inherited from the father and the mother.
There are therefore three types of DNA test:
As the Y-chromosome is passed down from father to son, only males can take this test. This test is useful for finding males with the same surname and seeing how and if they are related.
This test can be used for the maternal lineage as mtDNA (mitochondrial DNA) is only passed by a mother to both male and female children. It can therefore be used to find relatives that share a common maternal ancestor.