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I believe that the stomach cells of a mosquito have nothing to do with this question at all. It's only significance is that you understand the phases of mitosis in an animal cell. Cells go through the cell cycle, and spend most of their time in interphase. This is the resting phase but actually periods of growth occur here and the chromosomes are replicated. In prophase, the chromosomes are coiled and thickened and visible and the nuclear membrane disappears. The centrosomes, present in animal cells separate and a spindle begins to form. In metaphase, the chromatids(doubled chromosomes) line up along the equator of the cell and the spindle fibers attach to the centromeres of each chromatid. In anaphase, the chromatids separate to form chromosomes and move toward opposite poles. In telophase, the chromosomes cluster together in each new cell and a nuclear membrane reforms around them. The cells begin to "pinch apart" and during cytokinesis the cytoplasm divides, forming two daughter cells. These are half the size of the original cell with the same number of chromosomes.
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