Organisms that undertake sexual reproduction alternate between ______ and fertilization.

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Organisms that undertake sexual reproduction alternate between meiosis and fertilization. Meiosis is the process by which a parent cell divides into four genetically unique cells, each with half the number of chromosomes as the original cell. Fertilization is the fusion of two gametes (sperm and egg) to form a zygote with a complete set of chromosomes. The alternation of these two processes allows for genetic diversity in offspring.

Organisms That Undertake Sexual Reproduction Alternate Between ______ and Fertilization