Question

what is the ploidy of all the cells (except for the basidia at a certain time) in these mushrooms?
a haploid (n)
b dikaryotic (n+n)
c diploid (2n)

Explanation:

Mushrooms are basidiomycetes. In their life cycle, most of the cells (excluding basidia at a certain stage) are dikaryotic. Dikaryotic cells have two haploid nuclei (n + n) that have not yet fused. Haploid (n) cells would be spores. Diploid (2n) cells are formed when the two nuclei in dikaryotic cells fuse, which mainly occurs in basidia during a specific phase.

Answer:

B. dikaryotic (n + n)