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Biology LibreTexts

15.7: Sexual Reproduction

Sexual reproduction is the formation of a new individual following the union of two gametes. In humans and the majority of other eukaryotes plants as well as animals the two gametes differ in structure ("anisogamy") and are contributed by different parents. Gametes need motility to be able to meet and unite and food to nourish the developing embryo. In animals (and some plants), these two rather contrasting needs are met by anisogametes: sperm that are motile (and small) and eggs that contain food.