Fungal reproduction

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10 Terms

1
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Do fungi reproduce in nature most frequently using sexual or asexual reproduction? 

Asexual

2
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Do fungi reproduce in nature most frequently using sexual or asexual reproduction? 

Asexual

3
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What are the general characteristics of sexual reproduction in fungi?

  • Diploid stage

  • The fusion of (haploid) nuclei from compatible mating types 

  • Creates a diploid nuclei, then undergoes meiosis, creating haploid spores

  • Involves the production of gametangia (grow towards opposite mating types) in filamentous fungi

4
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What is meant by bipolar compatibility? By tetrapolar compatibility?

Bipolar: 

  • 1 mating Locus, 2 alleles (+ and -, so a - and - cannot happen) 

Tetrapolar

  • 2 mating locus, 2 or more alleles 

  • A, B locus , alleles, A1,A2,...

  • Ex A1B1 a partner has to be different at both loci 

5
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Homothallic:

Self fertilization

6
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Heterothallic

 needs partner

7
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Plasmogamy

cytoplasm fuse

8
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Karyogamy

Fusion of nuclei 

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Dikaryon

2 nuclei in cytoplasm 

10
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What are the general steps that occur during sexual reproduction in fungi? Be able to describe the major events at each step.

  • Secretion and detection of pheromones 

  • Production of gametangia (specialized hyphae grows towards) 

  • Plasmogamy (degrade cell wall, membranes fuse) 

    • Dikaryon (2 nucleotides)  

  • Karyogamy: nuclei fuse for diploid nucleus

  • Meiosis (genetic recombination, and reductive division) 

  • Formation of sexual spore