B3 revision tool 2
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- Created on: 03-10-15 12:30
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- Biology Unit 3
- Mitosis
- 1- the DNA will replicate itself so there is double as much DNA
- 2-the DNA will coil into chromosones
- 3- The chromosomes will line up in the middle of the cell.
- 4-cell fibires pull the cell apart and two arms of each chromosone go to the opposite ends of the cell.
- 5-The cytoplasym divides and you have two identical cells
- Meisois
- 1-DNA replicates itself and coils into chromosome which line in pairs in the middle of the cell.
- 2-the chromosome pairs exchange a small section of their DNA to provide variation in the offspring
- 3-the pairs split up into two different cells in which there is still 100% of the usual amount of DNA
- 4-the cells split again just like in mitosis. Leaving four new cells with half the amount of DNA
- Stem cells
- These are un-differentiated
- They can develop into any possible type of cell, depending on the instructions that they are given.
- Stem cells may be able to cure diseases
- Scientist scan extract stem cells to be able to grow tissues to treat medical conditions.
- These are un-differentiated
- Mitosis
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