Question

cell growth and division assessment
why must dna replication have to occur before a cell can divide by mitosis?
to allow crossing over to occur in each of the cells produced
to maintain the same number of chromosomes in the daughter cells as in the parent cell
to cause all of the cells produced to have half the number of chromosomes as the parent cell
to cause one of the cells produced to have double the number of chromosomes as the parent cell

Explanation:

DNA replication occurs before mitosis to ensure that each daughter cell receives an identical set of chromosomes as the parent cell. Crossing - over occurs in meiosis, not mitosis. Mitosis produces daughter cells with the same number of chromosomes as the parent cell (not half or double).

Answer:

to maintain the same number of chromosomes in the daughter cells as in the parent cell