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Cell and Molecular Biology for Environmental Engineers by Ryan Rogers

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CHAPTER 5

MEIOSIS AND THE FORMATION OF GAMETES

5.1 THE MEIOTIC PROCESS

In order to preserve characteristic ploidy in sexually producing organisms, gametes must be haploid. Gametogenesis occurs via meiotic division of diploid gametocytes to form haploid sperm and egg or, as in plants, this process can occur as a result of mitosis in haploid gametophyte cells. There are characteristic phases in meiosis, each associated with the association and movement of homologous chromosomes; however, it is important to note that the majority of movements in this form of cell division are random in order to promote genetic diversity in daughter cells. Meiosis is characterized by two rounds of cell division, Meiosis I and Meiosis II, to produce four unique ...

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