Genetic drift: the problem and its possible solution by frozen-embryo storage.
D000818:Animals; D004622:Embryo, Mammalian / Q000502:physiology; D005615:Freezing; D005787:Gene Frequency; D051379:Mice; D008815:Mice, Inbred Strains / Q000235:genetics*; D009154:Mutation; D011309:Preservation, Biological