Start studying chapter 31. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The impact of ploidy on adaptation is a central issue in evolutionary biology. While many eukaryotic organisms exist as diploids, with two sets of gametic genomes residing in the same nucleus, most basidiomycete fungi exist as dikaryons in which the two genomes exist in separate nuclei that are physically paired and that divide in a coordinated manner during hyphal extension. Fig. 6. The dikaryon: a specialised binucleate heterokaryon. The dikaryotic state is maintained by the clamp connection: a backward-projecting hyphal branch which fuses with its parent hypha to deliver one of the nuclei and ensure that each compartment contains two nuclei of opposite mating type separated by a dolipore septum. MONOKARYON MYCELIUM AND DIKARYON MYCELIUM BY γ-IRRADIATION IBRAHIM MAHMOOD1,2, AZHAR MOHAMAD2, FAUZI DAUD1, ZAITON ABDUL KADIR1,2, HING JAN NIE2, HISHAM HAMZA HUSSAIN1,2, WAN SAFINA WAN ABD RAZAK1,2, AIRIANAH, O.B.1 and SHAZRUL FAZRY1* 1School of Biosciences and Biotechnology, Faculty of Science and Technology, Terms discussed: dikaryon, diploid, diploidization, haploid, hypha (pl. hyphae), karyogamy, monokaryon, mycelium (pl. mycelia) A fungus begins its existence as an independent biont as some sort of propagule, most often a spore. From the spore, the fungus grows in a thread-like, branching formation known as a hypha. The dikaryon stage. In animals, plants, and some fungi, the fusion of two haploid cells during reproduction immediately results in a diploid cell (2n). But in other fungi, namely basidiomycetes and ascomycetes, an intervening dikaryotic stage (1n + 1n) occurs before the parental nuclei fuse and form a diploid nucleus. In ascomy- cetes, this dikaryon stage is brief, occurring in only a few dikaryon A cell of a fungal hypha or mycelium containing two haploid nuclei of different strains. The nuclei associate in pairs but do not fuse, therefore the cell is not truly diploid. Dikaryosis occurs in the Basidiomycota and Ascomycota. See heterokaryosis. Source for information on dikaryon: A Dictionary of Biology dictionary. PDF | Lentinula edodes or commonly known as shiitake is a cultivated edible mushroom. This mushroom has been used in pharmaceutical, nutraceutical and... | Find, read and cite all the research you BIOL 119 Study Guide - Midterm Guide: Dikaryon, Mycelium, Heterokaryon. by OC2442722. School. SUNY Geneseo. Department. Biology. Course Code. BIOL 119. Professor. Feissner/ Mc Carthy. Study Guide. Midterm. This preview shows page 1. Sign up to view the full 5 pages of the document. 1. In septate fungi, wha t structures allo w cytoplasmic streaming . to distribute needed nutrients, synthesize d b. sporangia... dikaryon c. mycelia... hypha d. hyphae... mycelium e. hyphae... chytrid. d. hyphae... mycelium. if all fungi in an environment that perform decomposition were to suddenly die, then which group of organisms should benefit most, due to the fact that their fungal competitors have been removed? a. protist b. flowering plants c. prokaryotes d. grasses. c. prokaryotes. when a
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