Chromomes appear thicker and shorter during
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The chromosomes appear thick and short and located near the periphery of the nucleus during diakinesis. This is the first point in meiosis where the four parts of the tetrads are actually visible. The sites of crossing over entangles together effectively overlap and make chiasmata clearly visible.
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During prophase I, they coil and become shorter and thicker and visible under the light microscope. The duplicated homologous chromosomes pair, and crossing-over (the physical exchange of chromosome parts) occurs. Crossing-over is the process that can give rise to genetic recombination.
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