genetic studies of chromosome segregation in such males reveal that ( 1 ) both the sex chromosomes and the large autosomes undergo nondisjunction , ( 2 ) the fourth chromosomes disjoin regularly , ( 3 ) sex chromosome nondisjunction is more frequent in cells in which the second or third chromosomes nondisjoin than in cells in which autosomal disjunction is regular , ( 4 ) in doubly exceptional cells , the sex chromosomes tend to segregate to the opposite pole from the autosomes and ( 5 ) there is meiotic drive ;
C0598175
chromosome segregation
C0007634
cells