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Comparing Cells

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Comparing Cell Cycles

Complete the Cell Cycle charts below. Describe the events in each phase for Cell Cycle A. Compare the steps in mitosis and meiosis for Cell Cycle B.

Cell Cycle A

|Phase |Describe the events in each phase |
|G1 (1st growth stage) |This is the portion of the cell cycle just after division, but before DNA synthesis. During this|
| |time the cell grows by producing proteins and organelles. |
|S (Synthesis) |DNA synthesis (or replication) occurs during this phase. At the beginning of the phase, each |
| |chromosome is single. At the end, after DNA replication, each chromosome consists of two sister |
| |chromatids |
|G2 (2nd growth stage) |This third subphase of interphase is a period of metabolic activity and growth. During this |
| |phase the cell makes final preparations for division. |
|Prophase of mitosis |Prophase occupies over half of mitosis. The nuclear membrane breaks down to form a number of |
| |small vesicles and the nucleolus disintegrates. A structure known as the centrosome duplicates |
| |itself to form two daughter centrosomes that migrate to opposite ends of the cell. The |
| |centrosomes organise the production of microtubules…...

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