The first stage in the first meiotic division of meiosis. The individual chromosomes of the cell become clearly visible within the nucleus with a light microscope as they condense from long, thin, wispy structures to thick structures, and they appear as a tangled jumble of paired, identical chromatids. Prophase ends with the disappearance of the nuclear membrane. This is identical to the prophase stage of mitosis.
Selected prophase I links: