No biochemical reaction is absolutely reliable, indicating that variations are expected during the process of copying DNA.

The two cells are not likely to be absolutely identical because variations can occur during the copying reactions involved in DNA replication.

Cell division occurs as a result of DNA copying. The separated DNA copies each have their own cellular apparatus, leading to the formation of two cells.

Separating the two copies of DNA is necessary because it is a fundamental step in reproduction. Simply pushing one copy out and keeping the other in the original cell would not be effective in generating new organisms with the same ...

A basic event in reproduction is the creation of a DNA copy, where cells use chemical reactions to build copies of their DNA.