question_answer

If sexual reproduction takes place between the filaments of Rhizopus of different strains, one with 80 nuclei and another with 24 nuclei, what would be the total number of spores of different strains put together?

A)  24             

B)  48

C)  96             

D)  114

Correct Answer: C

Solution :

 Sexual reproduction in Rhizopus takes place by gametangiaIJcapulation. The fusing gametangia are multinucleate and similar in every aspect but are distinct genetically. During copulation, wall of the two gametangia dissolve at the point of contact and the nuclei of gametangia fuse to form diploid nuclei. The structure formed by fusion is known as zygospore. At the time of germination, the zygospore undergoes meiosis.