Gene DosageEmbryo, MammalianEmbryo, NonmammalianChick EmbryoDosage Compensation, GeneticEmbryo ImplantationBlastocystEmbryonic DevelopmentGene Expression Regulation, DevelopmentalEmbryo LossPhenotypeMutationEmbryonic and Fetal DevelopmentFertilization in VitroPregnancyDosage FormsCleavage Stage, OvumBlastomeresHeterozygoteMolecular Sequence DataAllelesMorphogenesisX Chromosome InactivationGene DuplicationBase SequenceTranscription FactorsX ChromosomeHomozygoteEmbryo DispositionAneuploidyZygoteMorulaMice, TransgenicRNA, MessengerHomeodomain ProteinsDown SyndromeZebrafishTrisomyMice, Inbred C57BLDrosophila ProteinsDrosophilaGenotypeChromosomes, Human, Pair 21HaploinsufficiencyGene DeletionCryopreservationGastrulaGenesBody PatterningTranscription, GeneticMice, Mutant StrainsIn Situ HybridizationChromosome MappingGene ExpressionOocytesDNA-Binding ProteinsPolyploidyIn Situ Hybridization, FluorescenceGenomic ImprintingPlasmidsMice, KnockoutAmino Acid SequenceDrosophila melanogasterCrosses, GeneticGenes, LethalGenes, FungalEmbryo ResearchSaccharomyces cerevisiaeCloning, MolecularSingle Embryo TransferCulture TechniquesCloning, OrganismMesodermEye AbnormalitiesTime FactorsGene Expression RegulationPolymerase Chain ReactionEctogenesisGenes, X-LinkedNuclear Transfer TechniquesDiploidyGene AmplificationEctodermGenes, RegulatorPregnancy RateZebrafish ProteinsSignal TransductionSex ChromosomesRepressor ProteinsMice, Inbred StrainsCell DifferentiationPAX2 Transcription FactorReverse Transcriptase Polymerase Chain ReactionPloidiesSuppression, GeneticCharcot-Marie-Tooth DiseaseChromosome AberrationsModels, GeneticHaploidyDNA