nondisjunction
noun
                                                                                                                            
                                                            non·dis·junc·tion
                    
                                                                                                              
                                                                                                                                  ˌnän-dis-ˈjəŋ(k)-shən  
                                                      
                                                          
            
                                
              
          
                                                      : failure of homologous chromosomes or sister chromatids to separate subsequent to metaphase in meiosis or mitosis so that one daughter cell has both and the other neither of the chromosomes                                      
                
                    
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