By the Pricking of My Thumbs...
- Episode aired Jan 18, 1971
The Doomwatch team investigates the myth about the XYY chromosome after a schoolboy is expelled for possessing it.The Doomwatch team investigates the myth about the XYY chromosome after a schoolboy is expelled for possessing it.The Doomwatch team investigates the myth about the XYY chromosome after a schoolboy is expelled for possessing it.