Nondisjunction, GeneticSyndromeCostello SyndromePrurigoAbnormalities, MultipleChromosomes, Human, Pair 22MeiosisDown SyndromeChromosome DisordersGenetic Diseases, InbornChromosome AberrationsChromosomes, Human, Pair 21Developmental DisabilitiesAneuploidyFetal DiseasesCrossing Over, GeneticHeart Defects, CongenitalTrisomyPedigreeMutationInfant, NewbornSex ChromosomesPregnancyAbnormalities, Radiation-InducedChromosomesChromosome SegregationX ChromosomeMaternal AgeRecombination, GeneticY ChromosomeCrosses, GeneticMetabolic Syndrome XCentromerePotoroidaeChromosome MappingTranslocation, GeneticMosaicismChromosomes, FungalMitosisChromatidsKaryotypingGenetic MarkersSecale cerealePaternal AgeDiploidyIn Situ Hybridization, FluorescenceChromosomes, InsectGenetic TechniquesNucleolus Organizer RegionSex Chromosome AberrationsNephrotic Syndromep-FluorophenylalanineSjogren's SyndromeDrosophila melanogasterChromosomes, Human, Pair 18X-RaysHeterozygoteSpermatocytesChromosomes, Human, Pair 13MetaphaseOocytesMutagensTurner SyndromeHygromycin BPhosphoribosylglycinamide FormyltransferaseChromosome BreakageChromosome BandingSister Chromatid ExchangeMonosomySynaptonemal ComplexMyelodysplastic SyndromesPhenotypePolyploidyGenes, RecessiveCushing SyndromeGenes, DominantChromosomes, PlantGenotypeHomozygotePollenAllelesAcute Coronary SyndromePolycystic Ovary SyndromeSpermatozoaSporesWilliams SyndromeAnaphaseDrosophilaZea maysDiGeorge SyndromeSaccharomyces cerevisiaeHorner SyndromePrader-Willi SyndromeLong QT Syndrome