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external fertilization |
Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson | 0.06 sec. |
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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. external fertilization, the union of male and female gametes outside the bodies from which they originated, such as occurs in frogs and most fish. 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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How can there be "pregnant females" in an animal with the external fertilization described in the article? |
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