4972506
Description
Flashcards by Heather Jones, updated more than 1 year ago
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Created by Heather Jones
over 8 years ago
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| Question | Answer |
| Interphase | Consists of G1, synthesis and G2. The cells DNA is unravelled and replicated, to double its genetic content. The organelles are replicated, and its ATP content is increased. |
| PROPHASE: Chromosomes condense, getting shorter and fatter. Centrioles start moving to opposite ends of the cell forming a network of protein fibres called the spindle. The nuclear membrane breaks down and the chromosomes are free in the cytoplasm. | |
| METAPHASE: The chromosomes line up along the equator and become attached to the spindle by their centromere. | |
| ANAPHASE: The centromeres divide, separating each pair of sister chromatids. The spindles contract, pulling the chromatids to opposite poles of the spindle, centromere first which makes the chromosomes appear V-shaped | |
| TELOPHASE: The chromatids reach the opposite poles on the spindle. They uncoil and become long and thin again and are now called chromosomes again. A nuclear envelope forms around each group of chromosomes so there are now 2 nuclei. The cytoplasm divides (cytokinesis) and there are now 2 daughter cells that are genetically identical to the original cell and each other. |
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