21-22andy abnormalities casestudies cc8532 chromosomes clinicalmedicine congenitalabnormalities congresses diseases downsyndrome ethics evidence-basedmedicine fitness general genes geneticaspects geneticcounseling geneticdiseases geneticpredispositiontodisease geneticresearch genetics genetictesting geneticvariation genomics gynecology haplorhini health human humanchromosome21 humanmoleculargenetics inborn internalmedicine medical medicalgenetics mendelianrandomizationanalysis metabolicdiseases methods molecularbiology moleculargenetics nutritiondisorders precisionmedicine prenataldiagnosis qu450 qz50g32761982 qz50m71831986 qz50t7941977 qz52 rc620 researchsubjects statisticalmethods statisticsastopic studyandteaching teratogens truthdisclosure ultrastructure wa950 wd205g3281990 wm300m7181984