BIO172W08Lec25CT - Lecture 25 Fertilization/Early...

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Unformatted text preview: Lecture 25: Fertilization/Early Development March 14, 2008 Today’s Outline 1. Multicellular Organisms: Life Cycles 2. Gametogenesis & Fertilization 3. Cleavage Announcements Biology 172 Multicellular Organisms are in the Domain Eukarya Life Cycles in Multicellular Organisms: Homo sapiens Definition: Syngamy (fertilization) is the fusion of two gametes to form the Diploid Zygote Life Cycles in Multicellular Organisms: Rana pipiens & Xenopus laevis (frog) Life Cycles in Multicellular Organisms: Drosophila melanogaster (fruit fly) Life Cycles in Multicellular Organisms: most Cnidarians Life Cycles in Multicellular Organisms: most Fungi Definition: A spore is a single cell not produced by syngamy that develops into a multicellular adult organism Life Cycles in Multicellular Organisms: Arabidopsis thaliana (cress, mustard family) Life Cycle Comparisons Taxon Gametogenesis to Fertilization Embryogenesis Growth & Maturation Chordates ( e.g, frogs, mammals) Haploid gametes Fertilized egg = zygote (diploid) Gastrulation Larval metamorphosis (some species) Progressive maturation to sexually mature adult stage Arthropods ( e.g., insects) Haploid gametes Fertilized egg = zygote (diploid) Gastrulation Variable metamorphosis Adult stage generally brief Cnidaria ( e.g., jellyfish, corals, anemones) Haploid gametes Fertilized egg = zygote (diploid) Larval metamorphosis Two adult life stages (second metamorphosis) Asexual reproduction Fungi (multicellular) No gametes Heterokaryons formed by fusion Zygote undergoes...
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This note was uploaded on 12/06/2009 for the course BIO 172 taught by Professor Clark during the Winter '08 term at University of Michigan.

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BIO172W08Lec25CT - Lecture 25 Fertilization/Early...

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