Jesus, being fully man, must have had a Y-chromosome, but since he was born of the Virgin Mary, where did it come from? A viewer submits this question in this clip from Fr. Spitzer's Universe and asks if any genetic testing has been done on blood from the Shroud of Turin or Eucharistic miracles.
For more on miracles, check out these articles on the intercession of Fulton Sheen and the miracles of Jesus from a historian's point of view.