What are the risks of a Y-DNA test ?
None. Y-DNA represents less than 1% of the whole DNA. Because Y-DNA is shared by all male family members sharing a same surname, it cannot be used to identify individuals. Y-DNA only determines if a person is male or female. It does not carry much medical information, except possibly for infertility. Tests for ancestry purposes only use a small fraction of the Y-DNA, and cannot even be used to determine infertility.
