AneuploidyMaternal Serum Screening TestsTrisomyDown SyndromePrenatal DiagnosisFetal DiseasesChromosomes, Human, Pair 18Pregnancy Trimester, FirstFetusUltrasonography, PrenatalPregnancyNasal BoneChromosomes, Human, Pair 13Pregnancy Trimester, SecondNeckGenetic TestingGestational AgeChromosomal InstabilityIn Situ Hybridization, FluorescencePreimplantation DiagnosisChromosome AberrationsKaryotypingChromosome SegregationPloidiesProspective StudiesChromosome DisordersAbnormal KaryotypeDiploidyMosaicismPolyploidyChromosomes, HumanNondisjunction, GeneticSpermatozoaAneugensPolar BodiesMeiosisChromosomes, Human, XCentrosomeMad2 ProteinsKaryotypeMitosisSex ChromosomesSpindle ApparatusMaternal AgeChromosomes, Human, YChromosomes, Human, Pair 21Genomic InstabilityInfertility, MaleChromosomesXYY KaryotypeMetaphaseKlinefelter SyndromeCytogenetic AnalysisY ChromosomeSex Chromosome AberrationsDNA, NeoplasmPrimed In Situ LabelingCytogeneticsAurora KinasesOligospermia