During prophase of meiosis l happens the duplicated homologous chromosomes pair up and exchange their chromatid segments.
Meiosis I begins with prophase I, a phase marked by the progressive condensation of chromosomes, exchange of genetic material between non-sister chromatids, formation of the spindle (bundle of microtubules), breakdown of the nuclear envelope and the beginning of the migration of homologous chromosomes towards to the metaphase plate.
In this case, is correct to say that the duplicated homologous chromosomes pair up and exchange their chromatid segments occurs in meiosis I.
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