How is a zygospore formed in the life cycle of a zygote fungus? How does it progress from a young zygospore to a mature zygospore?
What will be an ideal response?
When nutrients are limited and hyphae of two compatible individuals come into close proximity, they produce branches (gametangia) that grow toward one another. As these branches grow, haploid nuclei stream into them and accumulate at their tips.
Cytoplasmic fusion of the gametangia produces a young zygospore that contains many haploid nuclei from each parent. Nuclei within the zygospore pair up and fuse to produce a mature zygospore with many diploid nuclei. The zygospore then germinates.
In short: Cytoplasmic fusion of the gametangia = young zygospore and fusion of two nuclei within the zygospore = mature zygospore.
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