Genetic Mosaics
A genetic mosaic is a creature whose body is built of a mixture of cells of two or more different genotypes. In mammals they arise by several different mechanisms: ...
Genetic mosaic An organism in which different cells contain different genetic sequence. This can be the result of a mutation during development or fusion of embryos at an early developmental stage.
They are one kind of "genetic mosaic." At about the 100 cell stage or less, either the paternal X or the maternal X is turned off.
Both types of abnormalities can occur in gametes and therefore will be present in all cells of an affected person's body, or they can occur during mitosis and give rise to a genetic mosaic individual who has some normal and some abnormal cells.
 See also: Human, Cells, Organ, Cell, Gene
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