Claim: A typical anther of a stamen contains four microsporangia where the microsporangia form sacs or pockets (locules) in the anther (anther sacs or pollen sacs) then these undergo meiosis to form haploid spores (the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes).
Evidence: A stamen typically consists of a stalk called the filament and an anther which contains microsporangia. A typical anther contains four microsporangia. The microsporangia form sacs or pockets (locules) in the anther (anther sacs or pollen sacs). These undergo meiosis to form haploid spores. Ploidy (/ˈplɔɪdi/) is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes.