9-9 Biology - zygospores are released under good conditions...

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4 9-9-10 Biology 7 Fungal life cycle (from slideshow) - opposite mating type fuse - form dikarion (not diploid) - meiosis - mitosis - 8 spores result -deuteromycota – imperfect fungi (no sexual stage) not on test, but on MCAT Fungal Diversity - 1. chytridiomycota o parasitic on organisms eg. Algae, misquito larvae, nematodes o or saprophytic o most live in fresh water, or moist soil o some are unicellular, others form mycelia which are branching chains of cells o only fungi that have flagella at any stage of the life cycle - 2. zygomycota o bread mold o have coenocytic hyphae o reproduce asexually by elongated or by sporangiphores (spores have the same genetic makeup) o sexual phase two hyphae of opposite mating types fuse produce dikaryon a covering is produced called a gametangium. The gametangium thickens to form a zygosporangium inside the zygosporangium (zygosporangium is different from sporangium) fertilization occurs zygospores are produced by meiosis a sporangium eventually sprouts which contains the zygospores
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Unformatted text preview: zygospores are released under good conditions, spores sprout to form new mycelium-3. ascomycota o sac fungi o produce spore filled sacs called asci, spores are called ascospores o two major groups hemiascomycetes • many species are unicellular (yeast) • reproduce asexually by fission or budding • reproduce sexually, two cells of opposite mating types fuse to produce a dikaryon and a zygote • this zygote undergoes meiosis and sometimes mitosis to produce ascospore within an ascus Euascomycetes • filaments ascomycetes including neurospora, chestnut blight, dutch elm disease, powdery mildews, penicillium • reproduce asexually by elongation or by producing conidia (conidia produce conidiospores) • reproduce sexually o two mating types fuse o form dikaryic hyphae o at the ends of the hyphae, sacs are produced called asci o fertilization occurs, meiosis and mitosis occur to produce 8 ascospores (all happens inside asci)...
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This note was uploaded on 07/14/2011 for the course BIO 7 taught by Professor Olsen during the Spring '11 term at East Los Angeles College.

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9-9 Biology - zygospores are released under good conditions...

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