Danielle Teuscher decided to give DNA tests as presents last Christmas to her father, close friends and 5-year-old daughter, joining the growing number of people taking advantage of low-cost, accessible genetic testing.
But the 23andMe test produced an unexpected result. Ms. Teuscher, 30, a nanny in Portland, Ore., said she unintentionally discovered the identity of the sperm donor she had used to conceive her young child.
