Question

How does meiosis and mitosis occur?

Answer 1

Mitosis and meiosis are two ways that cells reproduce. By mitosis a cell splits to create two identical copies of the original cell. In meiosis cells split to form new cells with half the usual number of chromosomes, to produce gametes for sexual reproduction.
The cell cycle or cell-division cycle is the series of events that take place in a cell leading to its division and duplication (replication) that produces two daughter cells.
Mitosis is a type of cell division. Mitosis occurs wherever more cells are needed. The process of growth and division is called the cell cycle.The cycle starts as the number of organelles - the different parts of the cell - increases. This is to ensure that each of the two new cells receives copies of all the organelles.
Before a cell divides, its chromosomes are copied exactly. The DNA molecule is made of two strands. As each of the two strands separates, new strands are made alongside each of them, thereby making two new copies.
Meiosis is a different kind of cell division. It is used to produce male and female gametes. A human body cell contains 46 chromosomes arranged in 23 pairs. The gametes are sperm or eggs, and only contain half as many chromosomes (23). This is why meiosis is sometimes called reduction division.