Deoxyribonucleic acid, fondly known as DNA, is a molecule in the shape of a double helix, which is responsible for storing genetic information in the cells of all living organisms. Most people know or should know this. But what is DNA made of exactly?
In this post, we will discuss what happens in the G1 and G2 Phases of the Cell Cycle. Cell division entails making more cells through duplication of the one cell’s contents and then splitting this cell into two equal and identical cells. These cells are identical to the parent cell. This is how we grow and replace injured cells.
The cell cycle encompasses the whole life of a cell from birth through to its death. It is the time from the formation of a cell from its parent cell until its division into its daughter cells. An important part of the cell cycle is cell division, the process whereby a cell is replicated to form either two daughter cells, through the process of mitosis, or asexual reproduction; or four daughter cells, through the process of meiosis, or sexual reproduction. However, this division forms only a small part of the cell cycle.
Feedback is defined as the information gained about a reaction to a product, which will allow the modification of the product. Feedback loops are therefore the process whereby a change to the system results in an alarm which will trigger a certain result. This result will either increase the change to the system or reduce it to bring the system back to normal. A few questions remain: How do these systems work? What is a positive feedback? What is negative feedback? Where do we find these systems in nature?