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Glossary Term
Glossary Term Mosaic
Definition An individual consisting of cells of two or more genotypes. One example is that of a normal female mammal heterozygous for different alleles of X-chromosome genes; because of the process of X-inactivation, such females consist of two cell types, each with a different X chromosome inactivated. This is an unusual example because there is no actual difference in genotype between the two cell types, but rather there is an epigenetic difference.

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Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Tumor Biology (MTB), Gene Ontology (GO), MouseCyc
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MGI 5.21
The Jackson Laboratory