- haploid hyphae---dikaryotic stage---- diploid zygote
- *all by meiosis
During sexual reproduction, hyphae from two different mating types make contact and fuse. You would expect the nuclei from two mating types to fuse immediately, however in some species, they do not fuse for days, months, and/or years. The nuclei continue to divide in such a way that every cell has one of each nucleus. A hypha that contains paired haploid nuclei is called n+n or dikaryotic. When the nuclei do eventually fuse, the zygote undergoes meiosis prior to spore formation. Fungal spores germinate directly into haploid hyphae without any noticeable embryological development.
- Asexual reproduction usually involves the production of spores by a single mycelium.
- Asexual reproduction can also occur by fragmentation--a portion of a mycelium begins a life of its own.
*Unicellular yeasts reproduce asexually by budding; a small cell forms and gets pinched off as it grows to full size
*nonmotile spores form during both asexual and sexual reproduction