[Campbell Biology P.713] Which of the following sequences correctly represents the major eve... | Practice Question

Which of the following sequences correctly represents the major events of sexual reproduction in Neurospora crassa as shown in Figure 31.18, starting from the fusion of mating types?

  • A: Plasmogamy → Karyogamy → Meiosis → Mitosis → Ascospore formation
  • B: Karyogamy → Plasmogamy → Meiosis → Mitosis → Ascospore formation
  • C: Meiosis → Karyogamy → Plasmogamy → Mitosis → Ascospore formation
  • D: Plasmogamy → Meiosis → Karyogamy → Mitosis → Ascospore formation

Explanation

The sexual reproduction cycle begins with the fusion of cytoplasm plasmogamy , forming dikaryotic hyphae. This is followed by the fusion of nuclei karyogamy within the ascus, leading to a diploid zygote. The diploid nucleus then undergoes meiosis, producing four haploid nuclei, which then divide by mitosis to yield eight haploid ascospores.