QQuestionBiology
QuestionBiology
"Which of the following occurs in a mushroom, that is, in the reproductive structure of a basidiomycete?
A) Diploid nuclei form, undergo meiosis, and produce haploid spores.
B) Heterokaryotic cells separate to re-create the original haploid hyphae.
C) Spores germinate and form a haploid mycelium.
D) Hyphae of two different mating types fuse."
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand the Basidiomycete Reproductive Cycle
Basidiomycetes (like mushrooms) have a complex sexual reproduction cycle involving several key stages: - They typically have a haploid mycelium - They form a specialized reproductive structure called a basidiocarp (mushroom) - Sexual reproduction involves specific nuclear events
Step 3:: Analyze the Nuclear Events in Basidiomycete Reproduction
In the basidiomycete life cycle: - Two haploid hyphae of different mating types fuse (plasmogamy) - This creates a heterokaryotic stage with two genetically different nuclei - These nuclei exist together but do not immediately fuse - Eventually, the nuclei fuse (karyogamy) to create a diploid nucleus
Step 4:: Meiosis and Spore Formation
The key event occurs when the diploid nucleus undergoes meiosis in the basidium (specialized reproductive structure), producing: - Four haploid nuclei - These haploid nuclei develop into basidiospores
Step 5:: Evaluate the Given Options
A) $$\checkmark$$ CORRECT: Diploid nuclei form, undergo meiosis, and produce haploid spores
B) Incorrect: Heterokaryotic cells do not re-create original haploid hyphae C) Incorrect: Spores germinate after being produced, not during mushroom formation D) Incorrect: Hyphal fusion occurs earlier in the reproductive cycle
Final Answer
A) Diploid nuclei form, undergo meiosis, and produce haploid spores.
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