Question

Why must DNA replication have to occur before a cell can divide by mitosis?

A. to maintain the same number of chromosomes in the daughter cells as in the parent cell
B. to cause one of the cells produced to have double the number of chromosomes as the parent cell
C. to allow crossing over to occur in each of the cells produced
D. to cause all of the cells produced to have half the number of chromosomes as the parent cell

Answer 1

DNA replication must occur before a cell can divide by mitosis to ensure that each daughter cell receives a complete copy of the genetic material from the parent cell.

Step-by-step explanation:

In order for a cell to divide by mitosis, DNA replication must occur. This is because DNA replication ensures that each daughter cell receives a complete copy of the genetic material from the parent cell. This process results in two identical chromosomes instead of just one. The replicated DNA is then divided into two complete sets during mitosis, ensuring that each cell has a complete set of genetic instructions.

Answer 2

I think D is right answer