[Campbell Biology P.707] Fungal sexual reproduction often begins with the release of pheromo... | Practice Question

Fungal sexual reproduction often begins with the release of pheromones. What is the primary role of these pheromones and the subsequent "compatibility test" in the life cycle, according to the text?

  • A: To prevent genetically identical mycelia from fusing, thereby contributing to genetic variation.
  • B: To attract mycelia of the same mating type to ensure self-fertilization and genetic stability.
  • C: To initiate immediate karyogamy between two haploid nuclei.
  • D: To trigger the formation of spore-producing structures for asexual reproduction.

Explanation

The text explains that fungal sexual reproduction begins with pheromones, and if mycelia are of different mating types, they fuse. The 'compatibility test' contributes to genetic variation by preventing genetically identical mycelia from fusing, thereby ensuring cross-fertilization and greater diversity.