At the point in the cell cycle when mitosis begins
A) the chromatids have separated into two identical chromosomes.
B) DNA replication begins.
C) each chromosome consists of two identical chromatids joined at the centromere.
D) chromosome number is halved.
E) the cell enters a dormant phase.

Question

Quizplus · Accepted Answer

At the start of mitosis, each chromosome consists of two identical chromatids joined at the centromere.

Answer: B is incorrect because DNA replication occurs before mitosis during the S phase of interphase.

Answer: D and E are incorrect because the chromosome number does not change during mitosis, and the cell does not enter a dormant phase but rather actively divides.

Answer: A is incorrect because chromatids do not separate into chromosomes until the end of mitosis during telophase.

At the Point in the Cell Cycle When Mitosis Begins