Information

Mitosis - Cell Division



Mitosis Steps in Animal Cell

Introduction (what it is)

Eventually the cells need to duplicate to make new cells. This cell division occurs in two ways: through mitosis and meiosis. In this text we will approach mitosis.

Practically, we can understand that in mitosis the cell doubles to give rise to two new cells. These are known as daughter cells (formed from cell division) and are identical to each other since they were formed from a single cell.

The stages of mitosis

Now that we know this, let's look at the five phases the cell goes through in its life cycle until it completes its division. They are: prophase, metaphase, anaphase, telophase and interphase.

Prophase

At this stage, the cells begin to prepare for division. It is at this time that the duplication of DNA and centrioles will occur. With the condensed DNA and the centrioles in motion, the process of mitotic division begins.

Metaphase

Here begins the alignment between the pairs formed in the previous phase. At this stage, the DNA aligns on the central axis as the centrioles begin their connection with it. Two strands of the chromosome connect in the central part of the centromere.

Anaphase

The division begins with the chromosomes migrating to opposite sides of the cell, half going one way and half going the other.

Telophase

This is the last phase of mitosis. At this stage the cell membrane divides into two parts, thus forming two new cells. Each will have half of the original DNA.

Interphase

This is the “normal” state of the cell, ie it is not in division here. At this stage, it maintains the balance of all its functions by absorbing the nutrients necessary for its maintenance. It will remain at this stage until it is ready for a new division, which will occur from the duplication of nucleic acids. From then on, the cycle restarts.

Main differences between mitosis and meiosis

Unlike mitosis, meiosis crosses over.

In mitosis two exactly identical daughter cells are generated, the genetic contents of the mother cell and daughter cells being identical and having the same number of chromosomes.

In meiosis, daughter cells have half the number of chromosomes in the mother cell.