Question

Can there be mitosis without DNA replication in S phase?

Answer 1

Hint: In cell division, Interphase, followed by M-phase and mitosis division involve the formation of two daughter cells from the single mother with equal number of chromosomes in each cell.

Complete Answer:
- Mitosis division cannot take place without DNA replication in S-phase.
- Cell division means the process by which matured cells divide to form two or four daughter cells.
- Cell division occurs in a pattern of cell-cycles.
- Cell- cycle consists of two main events in which first is interphase and another is M-phase.
- Interphase consists of $G_1$ phase, S-phase and $G_2$ phase, where in the S-phase the DNA replication process occurs to make extra copies of DNA and make it able to further development.
- The chromosomes replication also occurs in S-phase. This replication of chromosomes ensures the number of distribution of chromosomes in mitosis division.
- Mitosis division consists of the division of a parent cell into two daughter cells with equal number of chromosomes to each cell. The replication of chromosomes already occurs in the S-Phase to carry out the mitosis division.

Note: Mitosis division is also called as somatic cell division in which equal distribution of chromosomes occur in daughter cells. In $G_1$ and $G_2$ phase, growth of cells continues. The formation of two daughter cells occurs after the end of interphase, which is followed by mitotic phase, which is a combination of mitosis and cytokinesis. Mitotic phase leads to the formation of two daughter cells. The daughter cells always have the same number of chromosomes.