AneuploidyMaternal Serum Screening TestsTrisomyDown SyndromePrenatal DiagnosisChromosomes, Human, Pair 18Fetal DiseasesPregnancy Trimester, FirstFetusPregnancyUltrasonography, PrenatalChromosomes, Human, Pair 13Nasal BonePregnancy Trimester, SecondNeckChromosomal InstabilityGenetic TestingIn Situ Hybridization, FluorescenceGestational AgePreimplantation DiagnosisChromosome AberrationsKaryotypingChromosome SegregationPloidiesChromosome DisordersAbnormal KaryotypeDiploidyMosaicismPolyploidyChromosomes, HumanNondisjunction, GeneticSpermatozoaAneugensPolar BodiesMeiosisChromosomes, Human, XCentrosomeMad2 ProteinsKaryotypeMitosisSex ChromosomesSpindle ApparatusMaternal AgeChromosomes, Human, YChromosomes, Human, Pair 21Genomic InstabilityInfertility, MaleProspective StudiesChromosomesXYY KaryotypeMetaphaseKlinefelter SyndromeCytogenetic AnalysisY ChromosomeSex Chromosome AberrationsDNA, NeoplasmPrimed In Situ LabelingCytogeneticsAurora KinasesOligospermiaSpectral KaryotypingSperm Injections, IntracytoplasmicM Phase Cell Cycle CheckpointsOocytesAurora Kinase AAbortion, SpontaneousChromatidsAmniocentesis