Expression of IncenpUASp.Tag:MYC under the control of Scer\GAL4VP16.nos.UTR leads to abnormal chromosome segregation (including missegregation of both chiasmate and achiasmate X chromosomes) in oocytes although a bipolar spindle forms in most of the oocytes as compared to controls. There are more severe defects in a IncenpEC3747 background.