A graphicised picture of a baby in utero
Media playback is unsupported on your device
Video

How does the science behind 'three person babies' work

The UK could be the first country to allow a technique which helps prevent genetic disease and produces so-called "three person babies".

Graham Satchell explains the science behind the birth of children fertilised using this technique.

  • 17 Dec 2014
  • From the section Health
Go to next video: Three-person IVF 'crosses ethical line'