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Fig. 22-1, p.350. Fig. 22-1, p.351. zygote fungi. sac fungi. club fungi. chytrids. microsporidians. FUNGI. amoeboid ancestors. Fig. 22-2, p.352. Fig. 22-4, p.353. Fig. 22-5, p.354. Fig. 22-3, p.352. The end club-shaped cell becomes a diploid (2 n ) zygote when its two nuclei fuse.
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zygote fungi sac fungi club fungi chytrids microsporidians FUNGI amoeboid ancestors Fig. 22-2, p.352
The end club-shaped cell becomes a diploid (2n) zygote when its two nuclei fuse. Diploid Stage Haploid Stage meiosis nuclear fusion Club-shaped cells, each dikaryotic (n + n), form at the margins of mushroom gills. After nuclear fusion, the 2n cell undergoes meiosis and bears four haploid spores at its tips. spore (n) Spores are released. gill Each germinating spore gives rise to a hypha that grows and becomes a branching mycelium. cap stalk After cytoplasmic fusion, new cells of the mycelium have two nuclei (n + n). Spore-bearing mushrooms form from this mycelium. cytoplasmic fusion hyphae of mycelium sexual spore (n) at gill margin Fig. 22-7, p.355