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#zygospores

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Fungi Classification

Fusion of two compatible hyphae in Zygomycota produces

Compatible mating types in heterothallic Zygomycota sense each other via trisporic acid pheromones inducing progametangial hyphal tips to meet and swell. Contact triggers septation to form progametangia, walls dissolve at contact point, plasmogamy merges cytoplasm containing haploid nuclei. Nuclei pair then karyogamy produces diploid zygote enlarging into thick-walled zygospore surrounded by zygosporangium exhibiting warty ornamentation. Conidia and sporangiospores asexual mitospores, ascospores belong to ascomycetes. This conjugation process names conjugation fungi, essential for genetic recombination and dormancy surviving unfavorable conditions before meiospore formation inside germ sporangium after meiosis.

Ref: Campbell Biology 12th ed., Chapter 31: Zygomycota Conjugation Zygospore Formation; NCERT Class 11 Phycomycetes Fusion; NCBI Mating Mucorales

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Fungi Classification

Zygomycota are characterized by formation of

Zygomycota sensu lato defined by sexual reproduction involving fusion of compatible progametangia from opposite mating types positive and negative forming thick-walled zygosporangium containing single zygospore. Karyogamy of haploid nuclei followed by meiosis yields haploid spores after dormancy period. Zygospore withstands desiccation due to melanized multi-layered wall with sporopollenin. Ascomycota produce ascospores, Basidiomycota basidiospores, conidia are asexual mitospores. Zygospore formation via conjugation, hence name conjugation fungi, differentiates this group despite modern split into Mucoromycota and Zoopagomycota maintaining characteristic zygosporogenesis. Meiosis inside zygosporangium after dormancy ensures genetic variation and dispersal of haploid progeny adapting to changing environmental conditions.

Ref: Campbell Biology 12th ed., Chapter 31: Zygomycota Zygospores Formation; NCERT Class 11 Phycomycetes; NCBI: Zygosporogenesis Review

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