Ch 31 - Fungi (1 slide per page)-1

Reproduction always sexual never asexual fuligo

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Unformatted text preview: bes (i.e. feed on decaying vegetation)) 75 Clade: Amoebozoa Subclade: Plasmodial Slime Molds • 500 spp • Plasmodium during most of life cycle • Feeding stage • 1 large cell w/ many diploid nuclei Physarum • Haploid spores created to wait out adverse conditions. • Reproduction always sexual never asexual Fuligo septica 76 Plasmodial Slime Mold 6. Zygote nucelus divides mitotically multiple times w/o cytokinesis 1. Diploid multinucleate plasmodium Reproduction is always sexual 5. Like cells fuse forming diploid zygote. Fertilization 4. Spores germinate in favorable conditions producing motile amoeboid or flagellated cells 2. Under harsh conditions makes fruiting body which produces haploid spores via meiosis 3. Spores w/ tough coat disperse through air and germinate in favorable conditions Figure 28.24 (Campbell et al.) 77 Clade: Amoebozoa Subclade: Cellular Slime Molds • 35 spp • Most of life cycle: solitary “amoebas” (a single cell w/ 1 haploid nucleus) • Reproduces sexually (i.e. join to form diploid zygote) • When food depleted amoebas aggregate (slug) and reproduce asexually 78 Cellular Slime Mold Reproduction Have Sexual and Asexual stages 6. Amoebas emerge from spore coat when conditions favorable 1. Two haploid amoebas fuse forming a diploid zygote (only diploid stage) which eats all other amoebas then forms outer wall. 2. Zygote divides via meiosis to 2 haploid inds. Each divides several times via mitosis to make 3. Wall ruptures multiple haploid inds. releasing new amoebas 5. Slug forms fruiting body and haploid cells divide asexually (mitosis) forming haploid spores Figure 28.25 (Campbell et al.) 4. When food is gone amoebas aggregate forming a “slug” (a colony of multiple inds.) MOVIES: http://www.youtube.com/watch?v=bkVhLJLG7ug http://www.youtube.com/watch?v=HKZ2LtfDrmg 81 http://acbailey88.blogspot.com/2010_04_01_archive.html 82 http://acbailey88.blogspot.com/2010_04_01_archive.html 83 http://acbailey88.blogspot.com/2010_04_01_archive.html 84 http://acbailey88.blogspot.com/2010_04_01_archive.html 85 Readings on which you will NOT be tested • Figure 31.13 • Figure 31.17 • Figure 31.19 • Figure 31.21 (Inquiry) • In general: – You are NOT responsible for definitions of terms or sections included in the text but which were not discussed in lecture – You are not responsible for the details of examples used in the text but not discussed in lecture. HOWEVER, these additional examples will help your understanding of concepts discussed and may be used on exams to test if you understand the general concepts. – You ARE responsible for material covered in lecture but not included in the readings 86 Next Chapter Chapter 29 – Plant Diversity I...
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This note was uploaded on 02/12/2014 for the course BIOLOGY 2011 taught by Professor Woo during the Fall '10 term at University of Central Florida.

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