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Unformatted text preview: Although we are familiar with, and comfortable with the animal life cycle, it's good to know how different organisms fit meiosis into their life cycles. Similarly, fertilization occurs at one point in an organism's life history. Fertilization occurs between two different haploid cells, called gametes, to form the zygote, or fertilized egg. The zygote obtains half its chromosomes from the sperm and half from the egg or from different gametes, the more general term. Fusion of gametes restores the diploid number, and in so doing, also restores homologous chromosomes (one of each kind being provided by the sperm and one of each kind coming from the egg). Since each gamete has a unique combination of chromosomes, each zygote will be unique, and genetic variation is both maintained and obtained within the species. We will now discuss typical life cycle patterns and look at the timing of meiosis in the life cycle....
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- Spring '10