Cell Division

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What are the two main checkpoints in the cell cycle?
(1) G1/S checkpoint (restriction point (2) G2/M checkpoint
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What are the purposes of check points (2)
(1) To prevent uncontrollable division that would lead to tumours (2) to detect and repair damage to DNA
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The molecular events that control the cell cycle happen in a specific sequence. Why? (2)
Ensures that the cell cycle cannot be reveresed (1) Ensures that the DNA is only duplicated once during each cell cycle (1)
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How do prokaryotic cells divide?
By binary fission (mitochondria and cholorplasts also divide by binary fission within a eukaryotic cell)
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PART 1 Discuss the ways in which genetic variation is production, including nuclear division (8)
Independent assortment of chromosomes (1) in metaphase 1 (1) Independent assorment of chromatids in metaphase 2 (1) This ensures that the homologous chromosomes come from different parents (1) which produces a large number of allele combinations (1)
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PART 2
Crossing over of non-sister chromatids (1) in prophase 1 (1) means that chromatids will have new combinations of alleles (1) mutation (1) changes the DNA base sequence (1) resulting in a change in the primary stucture of a protein (1)
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Explain why meoisis needs to have twice as many stages as mitosis
To reduce number of chromosomes from 2n to n (1) and to seperate homologous pairs and sister chromatids
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Other cards in this set

Card 2

Front

What are the purposes of check points (2)

Back

(1) To prevent uncontrollable division that would lead to tumours (2) to detect and repair damage to DNA

Card 3

Front

The molecular events that control the cell cycle happen in a specific sequence. Why? (2)

Back

Preview of the front of card 3

Card 4

Front

How do prokaryotic cells divide?

Back

Preview of the front of card 4

Card 5

Front

PART 1 Discuss the ways in which genetic variation is production, including nuclear division (8)

Back

Preview of the front of card 5
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