Abstract

Background and Aim: Post-zygotic or “mosaic” aneuploidy, aka the presence of a subset of cells with an aberrant number of chromosomes, is a frequent feature of human preimplantation embryos. A high incidence of aneuploidy within an embryo is recognized as the major cause of developmental arrest and miscarriage. Post-zygotic aneuploidy often arises during the zygotic division and it is not only exclusive of human embryos, but has a similar occurrence in nonhuman primate, bovine, and equine embryos.

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