It is thought that ordinarily two surviving nuclei, one from each parent, fuse to form a diploid cell which then undergoes meiosis to form haploid meiotic products. These then reproduce by mitotic divisions leading to the formation of a sporangium structure (germosporangium) that develops out from the zygospore.
Two nuclei, one from each parent, typically fuse into a diploid cell which undergoes meiosis to produce haploid meiotic products. These then reproduce through mitotic divisions, leading to the formation of a sporangium structure (germosporangium) that develops out from the zygospore.