John Breach, chairman of the British Independent Fruit Growers Association, said: 'I've never seen this happen before to a Golden Delicious. It is extremely rare. It is an extreme mutation.
'There has been the occasional case of this type reported. If there was a whole branch of apples with the same colouring then fruit experts would get even more excited.'
Jim Arbury, fruit superintendent at RHS Garden Wisley in Surrey, said it was probably the 'result of a random genetic mutation'.
'This is known as a chimera where one of the first two cells has developed differently giving rise to one half of the apple being different,' he said.
Morrish is keeping the apple in his refrigerator because so many people want to see it. Link -via J-Walk Blog
(image credit: Archant Devon)