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Meiosis is a specialized cell division that reduces the chromosome number from diploid to haploid and is essential for sexual reproduction. In animals, meiosis occurs differently in oogenesis and spermatogenesis, although both involve meiosis I (reductional division) and meiosis II (equational division). In oogenesis, meiosis begins during the embryonic stage. Oogonia proliferate by mitosis and differentiate into primary oocytes, which enter meiosis ______ ________ ______ ____ ______ ___ ______ ________ ______ _______.
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