Q1. Place the following terms in the correct place on the fungal life cycle diagram AND label each structure as haploid (n), diploid (2n), or heterokaryotic (dikaryotic; n+n).

Background

Topic: Fungal Life Cycle

This question tests your understanding of the stages in the fungal life cycle, including the transitions between haploid, diploid, and dikaryotic phases, and the processes of sexual reproduction.

Key Terms:

• Mycelium: The network of fungal hyphae, usually haploid (n).

• Gametes: Haploid reproductive cells.

• Zygote: Diploid cell formed after karyogamy.

• Karyogamy: Fusion of nuclei (creates diploid stage).

• Meiosis: Reduces chromosome number, produces haploid spores.

• Plasmogamy: Fusion of cytoplasm (creates dikaryotic stage).

• Spores: Haploid cells for dispersal.

• Fruiting body: Structure for spore production, often dikaryotic.

Key Concepts:

• Haploid (n): One set of chromosomes.

• Diploid (2n): Two sets of chromosomes.

• Dikaryotic (n+n): Two nuclei per cell, each haploid.

Step-by-Step Guidance

1. Identify the starting point: Mycelium with mating types (– and +) are haploid (n).

2. Plasmogamy occurs when two haploid mycelia fuse their cytoplasm, resulting in a dikaryotic (n+n) stage.

3. The dikaryotic mycelium forms the fruiting body, which is also dikaryotic (n+n).

4. Karyogamy happens inside specialized cells, fusing the two nuclei to create a diploid (2n) zygote.

5. Meiosis follows karyogamy, producing haploid (n) spores from the diploid zygote.

6. These spores germinate to form new haploid mycelia, restarting the cycle.

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Q1a. Do fungi spend most of their life cycle in haploid or diploid forms?

Background

Topic: Fungal Life Cycle Dominance

This question tests your understanding of which ploidy stage dominates the fungal life cycle.

Key Terms:

• Haploid (n): One set of chromosomes.

• Diploid (2n): Two sets of chromosomes.

• Dikaryotic (n+n): Two haploid nuclei per cell.

Step-by-Step Guidance

1. Recall the stages of the fungal life cycle: haploid, dikaryotic, and diploid.

2. Consider which stage lasts the longest in most fungi.

3. Think about the duration of the diploid stage compared to the haploid and dikaryotic stages.

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Q1b. What kind of life cycle is this (gametic, sporic, zygotic)?

Background

Topic: Types of Eukaryotic Life Cycles

This question tests your ability to classify the fungal life cycle based on when meiosis occurs and which stage is dominant.

Key Terms:

• Gametic life cycle: Diploid dominant, gametes produced by meiosis.

• Sporic life cycle: Alternation of generations (both haploid and diploid multicellular stages).

• Zygotic life cycle: Haploid dominant, zygote is the only diploid stage.

Step-by-Step Guidance

1. Review the diagram and note when meiosis occurs.

2. Determine which stage is multicellular and dominant.

3. Compare the fungal life cycle to the definitions of gametic, sporic, and zygotic cycles.

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Q1c. What are advantages of the sexual portion of the life cycle? What about the asexual portion?

Background

Topic: Sexual vs. Asexual Reproduction in Fungi

This question tests your understanding of the evolutionary benefits of sexual and asexual reproduction in fungi.

Key Terms:

• Sexual reproduction: Involves genetic recombination.

• Asexual reproduction: Produces genetically identical offspring.

Step-by-Step Guidance

1. Consider the benefits of genetic diversity from sexual reproduction.

2. Think about the speed and efficiency of asexual reproduction.

3. Reflect on how each mode helps fungi adapt to their environment.

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Q1d. What are the ways fungi can spread? Which of these allows for long distance spread?

Background

Topic: Fungal Dispersal Mechanisms

This question tests your knowledge of how fungi disperse and which methods are most effective for long-distance spread.

Key Terms:

• Spores: Tiny reproductive cells dispersed by wind, water, or animals.

• Mycelial growth: Local spread through substrate.

Step-by-Step Guidance

1. List the main dispersal methods: spores and mycelial growth.

2. Consider which method is most effective for covering large distances.

3. Think about environmental factors that aid spore dispersal.

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Q2. Re-draw only the new part of your Mindomo Tree and check it with your LA. It should include: Groups: Fungi, Animals; Traits: multicellularity, absorptive heterotrophy, cell wall, mobility, complex organ systems, zygotic life cycle, gametic life cycle.

Background

Topic: Comparative Traits of Fungi and Animals

This question tests your ability to organize and compare key traits of fungi and animals in a conceptual diagram.

Key Terms:

• Multicellularity: Composed of multiple cells.

• Absorptive heterotrophy: Obtain nutrients by absorption.

• Cell wall: Structural feature present in fungi, absent in animals.

• Mobility: Ability to move (animals are mobile, fungi are not).

• Complex organ systems: Present in animals.

• Zygotic life cycle: Fungi.

• Gametic life cycle: Animals.

Step-by-Step Guidance

1. Start by drawing two branches: one for Fungi, one for Animals.

2. List traits under each group: e.g., Fungi (multicellularity, cell wall, absorptive heterotrophy, zygotic life cycle); Animals (multicellularity, mobility, complex organ systems, gametic life cycle).

3. Highlight differences: cell wall (present in fungi, absent in animals), mobility (present in animals, absent in fungi).

4. Include shared traits: multicellularity.

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Q3. For each of the following fungi, describe the structures and processes involved in feeding and reproduction. Explain the ecological roles/interactions. For mutualistic species, highlight what the fungus obtains from its partner and what it provides.

Background

Topic: Fungal Diversity and Ecological Roles

This question tests your ability to analyze different fungi, their feeding and reproductive strategies, and their ecological interactions.

Key Terms:

• Hyphae: Filamentous structures for feeding.

• Fruiting body: Structure for spore production.

• Mutualism: Symbiotic relationship where both partners benefit.

• Parasitism: One organism benefits at the expense of another.

Step-by-Step Guidance

1. For each fungus, identify its feeding structures (e.g., hyphae, fruiting body).

2. Describe its reproductive process (sexual/asexual, spore production).

3. Explain its ecological role (decomposer, pathogen, mutualist).

4. For mutualists, specify what the fungus gives and receives in the partnership.

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Mycena inclinata (clustered bonnet mushroom)

Puccinia triticina (wheat leaf rust fungus)

Ophiocordyceps unilateralis (ant-infecting fungus)

Parmotrema praesorediosum (lichen)

Rhizophagus irregularis (mycorrhizal fungus)