[Campbell Biology P.711] Based on Figure 31.15, which of the following accurately describes ... | Practice Question

Based on Figure 31.15, which of the following accurately describes the sequence of events and associated ploidy changes during the sexual reproduction of Rhizopus stolonifer ?

  • A: Plasmogamy (n+n) → Karyogamy (2n) → Meiosis (n) → Genetically diverse spores (n)
  • B: Karyogamy (n+n) → Plasmogamy (2n) → Meiosis (n) → Genetically identical spores (n)
  • C: Meiosis (2n) → Plasmogamy (n) → Karyogamy (n+n) → Genetically diverse spores (n)
  • D: Plasmogamy (n) → Meiosis (n+n) → Karyogamy (2n) → Genetically identical spores (n)

Explanation

Sexual reproduction in Rhizopus stolonifer begins with plasmogamy fusion of cytoplasm forming a heterokaryotic n+n zygosporangium. Karyogamy fusion of nuclei then occurs, leading to diploid 2n nuclei. When conditions are favorable, meiosis occurs, producing haploid n spores that are genetically diverse.