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8 Cards in this Set
- Front
- Back
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Spallanzi
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filtered toad semen devoid of sperm would not fertilize eggs
(but then concluded that viscuous fluid on paper was driving force for fertilization) |
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JL Prevost & JB Dumas
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1. sperms are not parasites, active agents in fertilization
2. universal existence of sperm in sex mature males and absence immature, aged and mule. sperm entered egg |
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A Von Kolliker
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formation of sperm fr cells in testes, believed no physical contact between sperm and egg. sperm excited egg to develop
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Hertwig
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meditteranean sea urchin (toxopneustes lividus), observed sperm entering egg and 2 nuclei unite
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Fol
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same as Hertwig, detailed mechanism of sperm entry
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Miller
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demonstrated that eggs of cnidarian Orthopyxis caliculata-secrete+regulate timing of release of chemotactic factor
-no attraction to eggs who has not completed 2nd meiotic division -sperm migrate towards egg after meiotic division |
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Smith and Suarez
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uncapacitated sperm binds to membrane of oviduct cells located at the ampulla
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Ralt and Co.
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experiment using follicular fluid of human similar to sea urchin experiment-drop of this to slide, saw some sperm stop and go towards drop
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