What happens to homologous chromosomes during metaphase of meiosis 1

In prophase I of meiosis, the homologous chromosomes form the tetrads. In metaphase I, these pairs line up at the midway point between the two poles of the cell to form the metaphase plate. ... Humans have 23 chromosome pairs, which results in over eight million (223) possible genetically-distinct gametes.

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where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?