Genetics Chimera
Genetics Chimera

In medical science, a chimera is an individual having more than one genetically-distinct population of cells that originated from more than one zygote.

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Genetics Chimera
Genetics Chimera
Genetics Chimera a chimera is an animal that has two or more different populations of genetically distinct cells that originated in different zygotes; if the different cells emerged from the same zygote, it is called a mosaicism. Chimeras are rare in human beings: there have been only about 40 reported cases.
Formation of Chimeras
Chimeras are formed from four parent cells (two fertilized eggs or early embryos fuse together) or from three parent cells (a fertilized egg is fused with an unfertilized egg or a fertilized egg is fused with an extra sperm). Each population of cells keeps its own character and the resulting animal is a mixture of miss-matched parts.
Human Genetic Chimeras
Human Genetic Chimeras
Chimeras get their start when two or more eggs are released and fertilized by different sperm. That usually results in fraternal twins. Unlike identical twins, fraternal twins are no more genetically alike than ordinary siblings. In a few cases, though, fraternal twins merge while in utero, becoming one single individual with a mosaic of different types of cells carrying distinct genetic codes. The mother’s blood cells carried DNA from one twin, her ovaries and eggs carried DNA from another.
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