LIFESCI 1 Lecture Notes - Lecture 18: Plasmogamy, Genetic Variation, Ug99
Document Summary
Morphology: hyphae (-> mycelium) may be coenocytic (multiple nuclei per cell, mycelium (formed by hyphae, septa in some fungus (separation between cells) Move by growing, mitosis (mycelium expansion); rapid growth when food source is encountered. Take organic c, break down into small compounds & transform into co2 released. Chytrids: don"t have hyphae, many are single cells, swimming spores and gametes (flagellated, pathogens affect frogs. Zygomycetes: growth of mycelium, sexual & asexual reproduction, production of aerial spores on stalks. Two genetically distinct haploid nuclei (result of sexual reproduction) Basidiomycetes: fruiting body, smuts, rusts, some rusts induce plant to grow pseudoflowers without reproductive structure, entice insects to transport fungal spores (nothing for insect) Ug99 (fungal rust: 90% of wheat has no resistance to it. Life cycle: asexual reproduction, sexual reproduction (mating types, not male/female gametes, heterokaryotic cell has two distinct nuclei, one from each mating type, heterokaryotic cell forms fruiting body, plasmogamy: cells fuse, karyogamy: nuclei fuse.
