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== What to expect from a DNA test ==
== What to expect from a DNA test ==
The purpose of a DNA test is to tell you where your line differs from another. Everyone's DNA is 99.9% similar to everyone elses and we are all related, so it is the differences we seek. We want to discover who our relatives are within a genealogically useful time frame.
Perhaps the most important and overlooked part of a DNA test is that it can tell you with relative certainty where a relationship '''does NOT exist'''. This is very valuable information. Once you know you are not related to a line, you can save money and time by not researching it.
Perhaps the most important and overlooked part of a DNA test is that it can tell you with relative certainty where a relationship '''does NOT exist'''. This is very valuable information. Once you know you are not related to a line, you can save money and time by not researching it.
::As with mtDNA, the single-line focus excludes other ancestors. This can be rectified by finding descendants of the other lines and having them test. That may not even be necessary, as a search for surname projects (available only at Family Tree DNA) may show that your other surname is already being researched.
::As with mtDNA, the single-line focus excludes other ancestors. This can be rectified by finding descendants of the other lines and having them test. That may not even be necessary, as a search for surname projects (available only at Family Tree DNA) may show that your other surname is already being researched.
::Y-DNA testing can include both SNPs and STRs. As with the other tests, SNPs provide information about ancient mutations. STRs provide information about more recent changes. A perfect match at 67 or 111 Y-STR markers can indicate a relationship within one or two generations (a first or second cousin). This allows for much more detailed clues into where lines intersect within a useful genealogical time frame.
== DNA Projects ==
== DNA Projects ==