A) xromosomaning ikkiga ortishi, ikkita xromotid hosil bolishi
B) xromosomalarning ekvator tekisligida joylashishi, xromotidlarning yaxlitlanishi
C) gomologik xromosomalarning birlashib buralishi, genetik axborot almashinuvi
D) xromotidlarning hujayra polyuslariga tarqalishi, yadro hosil bolishining boshlanishi