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spermatogenesis oogenesis ovulation fertilization
Spermatogenesis is the process where sperm cells are produced in the testes. It begins with primordial germ cells that undergo mitosis and meiosis to form haploid spermatids. These spermatids then undergo spermiogenesis where they morph into mature sperm cells. Oogenesis occurs in the ovaries and begins with primordial germ cells that become oogonia. During fetal development and after puberty, oogonia undergo meiosis to form haploid ova, or egg cells. The ova arrest during meiosis until ovulation, where they may be fertilized to complete meiosis. Fertilization can then occur if an ovum meets a sperm in the fallopian tubes.
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