Noun
meiosis in which there is a failure of paired homologous chromosomes to separate; results in an abnormal number of chromosomes in the daughter cells
Source: WordNetAutosomal genetic disorders can arise due to a number of causes, some of the most common being nondisjunction in parental germ cells or Mendelian inheritance of deleterious alleles from parents. Source: Internet
An incident in chromosome separation during anaphase II (of meiosis II ) called nondisjunction can result in sperm cells with an extra copy of the Y-chromosome. Source: Internet
When the segregation is not normal, it is called nondisjunction. Source: Internet