Bio 111 - Lecture 7

Bio 111 - Lecture 7 - Biology 111 Lecture 6 - Kingdom Fungi...

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Biology 111 Lecture 6 - Kingdom Fungi September 24, 2007 I. Classifcation: True Fungi (excludes the fungus-like protists) - eukaryotic - multicellular hyphae, may be coenocytic (multiple nuclei throughout with no dividers) - cell walls of chitin - haploid adults - heterotrophic by absorption - no motile stage in their life cycles - fungi descended from aquatic, single celled, Fagellate protist. PHYLA OF FUNGI A. Phylum Zygomycota - Bread Molds - Zygomycetes 1. Coenoctic hyphae 2. Isogamy - Syngamy involves two gametes that are identical in size 3. Zygosporangia (little brown balls) - tough protective cell wall around zygote (2n stage in the cell cycle, diploid) - Examples 1. Black Bread mold Rhizopus stolonifer - haploid genetic condition - aseptate hyphae (nuclei are divided into individual chambers) 2. Dung ±ungus, Pilobolus - lean towards light - shoot sporangia more than 2 meters - sporangia stick to grass - animals eat grass and sporangia, spreading and planting the fungus in its dung B. Phylum Ascomycota - Sac Fungi or Ascomycetes - meiosis occurs in little sac-shaped cells called asci , producing ascospores (pass right through animals) - sexual spores borne internally in the asci (sac cells) - nuclei fuse together to form a diploid zygote that goes through mitosis
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1. Septate hyphae (septum)
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Bio 111 - Lecture 7 - Biology 111 Lecture 6 - Kingdom Fungi...

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