Genealogy is the second biggest hobby in the US after fishing, in terms of money spent.
The size of this market and its rapid increase due to online Genealogy (like the startup I worked on before Moreover, Origins.net) has stimulated the use of mitochondrial and Y-chromosome tests to create family histories.
What has long been suspected is now being shown – that a real number percentage of people's fathers are not who they think. This latest test (which is based on paternity claims data and therefore is high) suggests an incredible 4 percent.
Even conservative estimates of illegitimacy rates suggest that if you trace your roots back over 100 years (not unusual for a genealogist), your family tree is probably inaccurate.
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