Final answer:
During prophase of mitosis, chromatin coils and visible chromosomes appear. Rosettes are present during metaphase, which is crucial for chromosomes' alignment before they separate. Interphase is the longest cell cycle phase, and mitosis generally lasts 1 to 2 hours, followed by cytokinesis.
Step-by-step explanation:
Chromatin coils appear during prophase, which is the first phase of mitosis. In this phase, the chromatin coils and condenses into visible chromosomes. The nucleolus disappears and the nuclear envelope disintegrates during this process. Rosettes, a higher-order packing of chromatin, are found during metaphase, when chromosomes are most condensed and aligned at the metaphase plate for proper separation.
Without proper alignment during metaphase, cells might experience problems such as unequal distribution of genetic material, leading to genetic disorders or cell death. Nuclear envelopes reform during telophase, and premature formation can lead to interference with chromosome separation and cell division. Cells spend most of their life in interphase, which includes G1, S, and G2 phases. Mitosis typically takes about 1 to 2 hours. Finally, cytokinesis, the division of the cytoplasm, occurs after mitosis concludes.