At the start of mitotic anaphase,

Question

Quizplus · Accepted Answer

During mitotic anaphase, the centromeres of each chromosome come apart. This allows the two sister chromatids to separate and move towards opposite poles of the cell.

Answer: D 
 Another key event in mitotic anaphase is that equivalent and complete collections of chromosomes have reached the two poles. This ensures that each daughter cell will have a complete set of chromosomes.

B and C are incorrect choices. Nuclear envelopes do not begin to form around the chromosomes until the end of mitotic telophase, and chromatid DNA does not replicate during mitotic anaphase as it has already replicated in the previous stages of the cell cycle.

At the Start of Mitotic Anaphase