Rhizopus species grow as filamentous, branching hyphae that generally lack cross-walls (i.e., they are coenocytic). They reproduce by forming asexual and sexual spores. In sexual reproduction, a dark zygospore is produced at the point where two compatible mycelia fuse.

Formation of Coenogametes in Rhizopus
Coenogametes are formed in the fungal genus Rhizopus during sexual reproduction. Rhizopus is a common saprophytic fungus that belongs to the class Zygomycetes. The formation of coenogametes in Rhizopus involves a unique process known as conjugation.

Conjugation in Rhizopus
- Conjugation in Rhizopus occurs between two different mating strains, the positive (+) and negative (-) strains.
- When the hyphae of the positive and negative strains come into contact, they undergo plasmogamy, where their cytoplasm fuses.
- This fusion results in the formation of a zygote or a diploid structure known as a zygospore.
- The zygospore undergoes karyogamy, where the nuclei fuse, resulting in the formation of coenogametes.
- Coenogametes are the sexual spores formed by the fusion of the nuclei in the zygospore.
- These coenogametes can then germinate and give rise to new Rhizopus individuals through the process of germination.

Significance of Coenogametes in Rhizopus
- Coenogametes play a crucial role in the sexual reproduction of Rhizopus by facilitating genetic recombination and variation.
- The formation of coenogametes allows for the exchange of genetic material between different mating strains, leading to the production of genetically diverse offspring.
- This genetic diversity is important for the survival and adaptation of Rhizopus in changing environmental conditions.
In conclusion, coenogametes are formed in Rhizopus through the process of conjugation, where the fusion of cytoplasm and nuclei leads to the formation of sexual spores. This reproductive strategy ensures genetic diversity and enhances the evolutionary success of Rhizopus as a fungal species.