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After research I find that the name for this mutation is chimera. They are apple chimeras, and more information is available at many sites on the internet. Just GOOGLE "fruit chimera" images. You will see many fruits and flowers which also have mutations. The following graphic examples come from the internet.
In plant chimeras the distinct types of tissue may originate from the same zygote, and the difference is often due to mutation during ordinary cell division. It all has to do with fertilization and division as far as I understand. Enough!