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internal fertilization |
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fertilization /fer·ti·li·za·tion/ (fer″tĭ-lĭ-za´shun) impregnation; union of male and female gametes to form the diploid zygote, leading to development of a new individual. external fertilization union of the gametes outside the bodies of the originating organisms, as in most fish. internal fertilization union of the gametes inside the body of the female, the sperm having been transferred from the body of the male by an accessory sex organ or other means. in vitro fertilization removal of a secondary oocyte, fertilization of it in a culture medium in the laboratory, and placement of the dividing zygote into the uterus. internal fertilization, the union of gametes within the body of the female after insemination. See also artificial insemination. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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However, he and a colleague propose that gender wars are more likely to flare into bodily harm among simultaneous-hermaphrodite species with internal fertilization than among their separate-sex counterparts. Beyond the question of sex itself as a reproductive mechanism lies why different forms of sexual reproduction have evolved, from sequential deposition of gametes by males and females separated in time and place to internal fertilization requiring sexual intercourse and gestation. Some species court their mates, and some even have internal fertilization of eggs. |
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