Three types of sexual life cycles

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All sexually reproducing species have certain key life cycle features in common, such as meiosis the production of haploid cells from diploid ones and fertilization the fusion of haploid gametes to form a diploid cell called the zygote. Beyond these basic elements, however, there can be a lot of variation in sexual life cycles. What do haploid and diploid mean? A haploid cell has just one complete set of chromosomes. Human sperm and egg cells are haploid. A diploid cell has two complete sets of chromosomes.
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Sexual Obsessions in OCD (Unwanted Sexual Thoughts) | Steven J. Seay, Ph.D.

The following "biological phases" are encountered during the life cycle: Within the life cycle, meiotic divisions more take place, in which cell proceed from a diploid to a haploid stage; in the diploid stage two homologous copies of each chromosome are present in the cells and in the haploid stage only one sample of each chromosome in present in each cell. Gametes are always haploid, whereas zygotes are diploid. Furthermore, during the life cycle mitotic divisions occur more about mitosis.
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Sexual Obsessions in OCD (Obsessive-Compulsive Disorder)

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