You asked: What factors affect mitotic index?

What factors influence mitotic index?

FACTORS THAT AFFECT MITOSIS

  • Growth & Repair. After an injury many cells are replaced in order to repair the damage. …
  • Nutrient availability. Nutrients are needed as a source of energy and as building blocks. …
  • Cell Type & Location. Body tissues that are replaced frequently have a higher rate of mitosis. …
  • Enzyme Activity.

Does temperature affect mitotic index?

The rate of cell progress, or mitotic rate, throughout the mitotic cycle increases linearly with increase in temperature between the range 3 °C to 25 °C.

What are three factors that affect cell division?

Factors Affecting Cell Division

  • Nutrients. The nutrients present in the cell affect cell division. …
  • Genetics. Genetic code regulates cell division. …
  • Chemicals. Exposure to toxic chemicals such as pesticides and some cleaning chemicals can cause cell mutation. …
  • Stress. Stress affects cell division.

Why is the mitotic index affected by pH?

If the pH of the surrounding is close to pH 5.5 to pH 6.5, the plant will have the highest mitosis(growth) rate, resulting in aheavier weight and a longer root. However, in pH 10 groups, the mitosis(growth) rate will be slower, resulting in a lighter weight and a shorter root.

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Why do some cells have a higher mitotic index?

An elevated mitotic index indicates more cells are dividing. In cancer cells, the mitotic index may be elevated compared to normal growth of tissues or cellular repair of the site of an injury.

What are some factors that might influence the cell cycle?

Typical external factors that influence cell division are the following:

  • Availability of raw materials can affect cell division. …
  • Radiation can change DNA molecules. …
  • Toxins can damage cell DNA. …
  • Viruses replicate by hijacking a cell’s metabolism to make copies of the virus, but viruses can also affect cell DNA.

What happens if a cell gets too cold?

Low temperature can also slow cell growth by prevent the cell’s increase in size. In extreme situations, such as prolonged exposure to sub-freezing temperatures, liquid in the cell can begin to freeze, forming crystals that pierce the membrane and might ultimately kill the cell.

How does temperature affect mitosis in plant cells?

If has been known for some time that low temperatures have a profound effect on mitosis. They retard or stop the mitotic cycle; reduce the rate of nucleic acid synthesis in the chromosomes; and prevent the chromosomes aligning on the metaphase plate.

What are 3 factors that control the cell cycle and cell division?

The cell cycle is controlled by many cell cycle control factors, namely cyclins, cyclin-dependent kinases (Cdks) and cyclin-dependent kinase inhibitors (CKIs). Cyclins and Cdks, which are positive regulators of the cell cycle, activate cell cycle factors that are essential for the start of the next cell cycle phase.

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What are the 3 cell cycle checkpoints?

There exist three major cell-cycle checkpoints; the G1/S checkpoint, the G2/M checkpoint, and the spindle assembly checkpoint (SAC).

What controls the cell division?

During mitosis, the nucleus, which holds the cell’s genetic information, is divided. During cytokinesis, the rest of the cell is divided. The result is two newly formed, identical cells. … These two phases are important for the control of cell division.