BIO172W08Lec25CT - Biology 172 L e c t u r e 2 5 : F e r t...

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1 Lecture 25: Fertilization/Early Development March 14, 2008 Today s Outline 1. Multicellular Organisms: Life Cycles 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
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2 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 Haploid adult life stages Asexual reproduction Zygote undergoes meiosis No gametes Heterokaryons formed by fusion Fungi (multicellular) Two adult life stages (second metamorphosis) Asexual reproduction Larval metamorphosis Haploid gametes Fertilized egg = zygote (diploid) Cnidaria ( e.g., jellyfish, corals, anemones) Alternation of generations (haploid/diploid) Continuous growth Asexual reproduction Morphogenesis without cel movement Multicel ular haploid gametophyte Fertilized egg = zygote (diploid) Angiosperms (flowering plants) Adult stage general y brief Gastrulation Variable metamorphosis Haploid gametes Fertilized egg = zygote
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BIO172W08Lec25CT - Biology 172 L e c t u r e 2 5 : F e r t...

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