page_title: Mosaic (genetics)
hierarchical_section_title: Mosaic (genetics)
caption_attribution_description: Calico cat (Felis silvestris catus)
context_page_description: In genetics, a mosaic means the presence of two different genotypes in an individual which developed from a single fertilized egg. As a result, the individual has two or more genetically different cell lines derived from a single zygote.
  Mosaicism may result from:
  Crossing-over during mitosis
  A gene mutation during development
  A chromosomal mutation during development
  X-inactivation: one X chromosome is randomly switched off in cells of a female mammal
  The phenomenon was discovered by Curt Stern. In 1936, he demonstrated that recombination, normal in meiosis, can also take place in mitosis. When it does, it results in somatic mosaics. These are organisms which contain two or more genetically distinct types of tissue.
context_section_description: In genetics, a mosaic (or mosaicism) means the presence of two different genotypes in an individual which developed from a single fertilized egg. As a result, the individual has two or more genetically different cell lines derived from a single zygote. 
  Mosaicism may result from:
  Crossing-over during mitosis
  A gene mutation during development
  A chromosomal mutation during development
  X-inactivation: one X chromosome is randomly switched off in cells of a female mammal
  The phenomenon was discovered by Curt Stern. In 1936, he demonstrated that recombination, normal in meiosis, can also take place in mitosis. When it does, it results in somatic (body) mosaics. These are organisms which contain two or more genetically distinct types of tissue.
caption: A typical calico cat
exif: {}