What are the three levels of organization in chromosomes starting with a DNA molecule and going up in size? Describe each of the lowest three levels on how the structure is arranged. 5. What does each duplicated chromosome consist of? 6. In human body cells, how many chromosomes can be found? How many came from each parent? 7. What are the four phases of the cell cycle? (Three of them occur during interphase). Describe the events that occur during each stage. 8. What happens during the G2 checkpoint before the cell is allowed to proceed in its cell cycle?

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