The fusion of two different mating types forms a dikaryon that is a heterokaryon. The term "heterokaryon" refers to the fact that
A) the hypha is haploid.
B) two nuclei fused in the course of its formation.
C) there are two genetically different nuclei in a single hypha.
D) the two nuclei have fused into a zygote.
E) None of the above
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