Mitosis
- Created by: Rachel Lynn13
- Created on: 23-01-16 18:16
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- Mitosis
- Mitosis makes new cells for growth and repair.
- Body cells normally have two copies of each Chromosome
- one from the organisms "mother" and one from its "father"
- Therefore humans have 2 copies of chromosome 1 and 2 copies of chromosome 2
- A human has 23 pairs of Chromosomes
- when a body cell divides it needs to make new cells identical to the original cell
- with the same number of chromosomes
- Body cells normally have two copies of each Chromosome
- Within a cell that is not dividing the DNA is all spread out in long strings
- if the cell gets the signal to divide then the DNA needs to duplicate
- so there is a copy for the new cell
- The DNA is coppied and forms X-shaped chromosomes
- Each "arm" of the chromosome is an exact duplicate of the other
- The chromosomes then line up at the center of the cell and cell fibers pull them apart
- The 2 arms of each chromosome goes to opposite ends of the cell
- membranes form around each of the sets of chromosomes
- These become the nuclei of the 2 new cells
- Lastly the cytoplasm divides
- if the cell gets the signal to divide then the DNA needs to duplicate
- Asexual also uses mitosis
- Some organisms reproduce by mitosis
- e.g strawberry plants form runners in this way, which become new plants
- This is an example of asexual reproduction
- The offspring have exactly the same genes as the parents
- There is no variation
- The offspring have exactly the same genes as the parents
- Some organisms reproduce by mitosis
- Mitosis makes new cells for growth and repair.
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