Let’s say that the father in the second couple you’re working with also has a genetic predisposition to have children of a specific gender—but in this case, girls. Given that information, these are the probabilities the couple has before taking the test: • The probability of the couple having a girl is 95%. • The probability of the couple having a boy is 5%. • The probability that the test is correct is 85%. • The probability that the test is incorrect is 15%.