It is possible for someone to trace their Jewish ancestry with a DNA test, according to Forward.com. Such tests have demonstrated that some people of Latino heritage probably had ancestors who were Jewish but were persecuted during the Middle Ages and had to hide their religious heritage.
Family Tree DNA, a genetic testing company, reports that it can compare an individual's genetics with a large group of data to find any matches to Jewish ancestors. The company uses several types of testing to check the lineage of an individual's father or mother in isolation to determine if specific genes are present. Additionally, the company states that it can locate relatives from up to six prior generations.