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 Mosaicism

Mosaicism is a condition in which cells within the same person have a different genetic makeup. This condition can affect any type of cell, including:
•
Blood cells

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Egg and sperm cells (gametes)

•
Skin cells

http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002294/

 Mosaic (genetics)

 In genetics, a mosaic or mosaicism denotes the presence of two or more populations of cells with different genotypes in one individual who has developed from a single fertilized egg. Mosaicism may result from a mutation during development which is propagated to only a subset of the adult cells.

http://en.wikipedia.org/wiki/Mosaic_(genetics)