HELLO PRAKHAR
Basidiomycete are very interesting fungi usually called Club fungi but any way to discuss and help you answer you're question Sexual reproduction in Basidiomycota takes place in the fruiting body, in specialized structures called basidia. The basidia is itself formed by plasmogamy between mycelia from two different spores. However keep in mind whenever you are talking about sexual reproduction you are talking about the process of MEIOSIS and the easiest way to think of Bacidimycota is that MEOISIS occurcing in BASIDIA will give you sexual reproduction, Asexual reproduction is always Mitosis and provides you with the same Polidity meaning (Diplod will give rise to Diploid, Haploid will give a Haploid) In Sexual reproduction however Meoisis only occurs with DIPLOIDS giving out HAPLOIDS. What happens is that obviously you know that the Dikaryotic (Nuclei do not combine therefore they stay kind of seperate and polidity is n+n) mycelium combine through Karyogamy (Process of combining nuclie making ploidity 2n) Than Soon after fusion, meiosis takes place, resulting in four haploid nuclei. The nuclei then migrate to the terminus of the basidium and form four individual projections. These projections are then separated by cell walls to become spores.
