Wednesday, February 3, 2010

What kind of hypha exists in all multicellular fungi?

please give answers!!What kind of hypha exists in all multicellular fungi?
Fungi have a special kind of hyphae for the majority of their life cycle that is dikaryotic, which means that that each cell has two separate nuclei. During the fusing of the two parent hyphae, the cytoplasm will join (plasmogamy), but the two nuclei will not! Then, the two nuclei will divide individually and independently, and the fungi will begin to grow. Each cell of the hyphae will have two distinct nuclei, each an exact copy of the original parent nuclei. This is the definition of dikaryotic hyphae. The fungi may continue to grow for years and years before karyogamy (fusing of nuclei) occurs in special cells in the basidiocarp (in basidiomycota, ascocarp for ascomycota) that will eventually become spores. Once the two nuclei fuse in these cells (2n), the ';zygote'; immediately undergoes meiosis, eventually producing haploid (1n) spores.

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