Question

1. when does dna replication happen and why?

Explanation:

DNA replication occurs during the S - phase of the cell cycle. This is to ensure that each new daughter cell receives an identical copy of the genetic material. The cell needs to duplicate its DNA before cell division (mitosis or meiosis) so that genetic information is accurately passed on.

Answer:

DNA replication happens during the S - phase of the cell cycle. It occurs to provide each new cell with a full set of genetic information for proper functioning and inheritance.