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C8) Cell division
Cells arrive from pre-existing cells.
| Question | Answer |
|---|---|
| Describe interphase. | The resting stage of the cell. Growth, duplication of organelles and DNA replication. |
| Describe prophase. | The first stage of mitosis. Chromosomes are formed, nuclear envelope disappears. |
| Describe metaphase. | The second stage of mitosis. Chromosomes become aligned on the metaphase plate in animals and the * in plants. |
| Describe anaphase. | The chromosomes are pulled apart as chromatids by the kinetochores/spindle fibres, to opposite poles of the cell. |
| Describe telophase. | The final stage of mitosis. Chromosomes uncoil, nuclear envelope reforms. |
| Describe cytokinesis. | The process by which a cell membrane (and cell wall) form to divide the cytoplasm in two, at the end of cell division. The cytoskeleton is involved in that it causes a cleavage furrow to form |
| Define diploid. | A cell which contains pairs of homologous chromosomes. |
| Define haploid. | A cell which contains only one of each pair of homologous chromosomes. |
| Define binary fission. | The method of reproduction of very simple organisms in which one cell divides into two. The DNA is replicated, the cell elongates, and eventually divides into two. |
| Describe the parts of interphase. | G1 (Growth 1) S (Synthesis) - DNA copies G2 (Growth 2) - cell prepares for division |