Practice question

Dikarya subkingdom unites two largest fungal phyla Ascomycota and Basidiomycota sharing derived character: formation of dikaryotic mycelium where cells contain paired haploid nuclei from different parents maintained via clamp connections or croziers, eventual karyogamy and meiosis inside ascus or basidium for spore production. Zygomycota and Chytridiomycota lack regular dikaryon with immediate nuclear fusion. Molecular phylogeny supports Dikarya monophyly comprising approximately 98% described fungi, includes yeasts, molds, mushrooms, lichens. Recognition clarifies evolution of complex fruiting bodies and advanced genetic regulation via mating-type loci distinguishing them from early diverging lineages.