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Meiosis is the process by which a regular diploid body cell divides and becomes 4 haploid gametes. It consists of two stages: Meiosis I and Meiosis II. Meiosis I is the first division of cells and Meiosis II is the second. This process is generally similar to regular Mitosis with a few differences that effect the end products.
In the zygotic life cycle the organism is haploid instead, spawned by the proliferation and differentiation of a single haploid cell called the gamete. Two organisms of opposing sex contribute their haploid gametes to form a diploid zygote. The zygote undergoes meiosis immediately, creating four haploid cells.