Use the word bank:

Meiosis does not always occur without any difficulties for example if nondisjunction happens the blank fail to blank thus the resulting cells do not have the correct amount of chromosmes in each cell

Bank:chromosomes, cytoplasm, pair, seperate

Meiosis does not always occur without any difficulties, for example, if nondisjunction happens, the chromosomes fail to separate, thus resulting in cells that do not have the correct amount of chromosomes in each cell.