The sex organs are______, but ___________is brought about by fusion of two vegetative or somatic cells of _________strains or genotypes. The resultant structure is dikaryotic which ultimately gives rise to________.
a. Present, gametic contact, different, ascus.
b. Absent, plasmogamy, different, basidium.
c. Present, gametic copulation, different, basidium.
d. Present, plasmogamy, different, ascus.