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Home >>Botany Dictionary >> Multiple Alleles - Myxamoeba
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Multiple Alleles - Said of a series of many alleles of particular factor. Naturally occurring multiple allelism is exemplified in incompatibility system of plants.
Multiple Factor Inheritance - Refers to inheritance pattern of characteristic which is governed by polygenes so that the characteristic exhibits a range of apporoximately continuous variation in phenotypic expression from one to another exterme e.g., size of beans, earlength in maize, etc.
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Multiple Fruit (composite fruit). A fleshy fruit developing from a complete inflorescence. Coenocarpium, sorosis, syconus etc., are multiple fruits.
Multivalant - The group of more than two homologues which are Formed during meiosis polyploids or polysomies.
Muricate - A structure having its surface covered by sharp points or prickles or hard, short protections.
Mushroom - Used for the fruiting body or sporophore of fungi of Agaricales whieh is unbrella-like in shape. It is composed of pseudoparenchyma of hyphae and is differentiated into a stalk (stipe) and a pileus at its top.Muskeg. A peat bog characteristically found in northern coniferous forests of North America. Common plants are pitcher plants, sundews, black spruce etc.
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Mutagen - Describing any agent causing increase in the frequency of mutation. It may be a chemical reading with nucleotides (e.g., nitrous acid, proflavin), short-wave radiations (e.g., ultravoilet,X-ray and cosmicrays), ionizing radiations (e.g., a β and rays) or base analogues incorporated in place of normal bases during DNA synthesis.
Mutation - Said of any sudden, inheritable change in genotype that is not taking place as a result of recombination and does not exist previously in the parents.
Mutation Theory - Theory proposed by Hugo-de-Vries in 1903 postulating that evolution takes place by natural selection operating on spontaneous mutations in a population.
Muton - Used for the gene which is defined as a unit of mutation i.e., the portion of inheritable material involving in mutation. Such a gene may be a single nucleotide only because any change in even one nucleotide will cause change in the whole sequence of bases coding for any protein and shall ultimately express as a mutation.
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Mutualism - Used for the biotic interaction which is taking place between two or more organisms and in which all the interacting partners get benefitted by the interaction and neither of them gets harmed. Symbiotic relationship mycorrhizal association etc., are examples.
Mycelia Sterilia - Used for the order Agonomycetales of Hyphomycetes. It is including about 200 species of 26 genera, the members of which are imperfect mycelial fungi and do not produce spores although some are developing sclerotia e.g., Rhizoctonia, certain species of which are possible for damping off disease and Sclerotium.
Mycelium - Said of the mass of branching, more or less loosely interwoven hyphae that make up the vegetative plant body of most fungi.
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Mycobiont - Used for the fungal partner in a lichen which is making up most of the body of lichen. It is generally a member of Asomycetes especially of class Discomycetes though members of other groups e.g., Basidiomycetes are also mycobiont in some lichens, Compare phycobiont.
Mycology - The science of fungi.
Mycorrhiza - Said of a symbiotic association which is taking place between a fungus and the roots of a plant. It is usually necessary for normal and proper ,growth of the plant.
Mycotrophic - Said of a symbiotic relationship between a fungus and whole body of a plant. It occurs by spread of mycorrhizal fungus to the aeiral parts of plant as in certain feathers and orchids.
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Myrmecochory - Said of the distribution of seeds or other repro ductive structures by ants as in Halleborus species.
Myrmecophily - Said of the condition of an organism that is living with a colony of ants. It is usually seen in animals but some flowering plants are also having specialized inflated organs to house ant colony e.g.,thornproviding shelter to ants and extra floral nectaries for their use in various species of tropical American Acacia,
Myxamoeba - A swarn cell (See swarm cell) which has lost flagella andmaincrease by division before it acts as gamete.
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