Mimesis see mimicry

mimetic a. [Gr. mimikos, initative] Characterized by mimicry.

mimetic polymorphism Polymorphism in which the various morphs resemble other species distasteful or dangerous to a predator; often restricted to females.

mimic n. [Gr. mimos, actor] 1. An organism that resembles another in color, habit or structure for the purpose of protection. 2. Nonallelic genes with similar phenotypic effects.

mimicry n. [Gr. mimikos, imitative] The resemblance in color or structure to other species that are distasteful or poisonous to a predator. see Batesian and Mullerian mimicry.

mines n. [Celtic origin] (ARTHRO: Insecta) Larval galleries or burrows on the inside of leaf tissue.

minim n. [L. minimus, least] 1. A very small object. 2. 1/60 of a fluid dram or 0.06 ml. 3. (ARTHRO: Insecta) In Formici-dae, a minor worker.

minor worker (ARTHRO: Insecta) An individual belonging to the smallest worker subcaste, esp. in Formicidae; a minim. see media worker, major worker.

minute a. [L. minutus, small] 1. Very small. 2. (ARTHRO: In-

secta) A few millimeters in length or less.

miolecithal a. [Gr. meion, less; lekithos, egg yolk] Referring to eggs containing little yolk.

miracidium n.; pl. -dia [Gr. dim. meirakion, young girl] (PLATY: Trematoda) In Digenea, the first larval stage; a ciliated, free-swimming form.

mirror n. [L. miror, to look at] (ARTHRO: Insecta) In Hemiptera Cicadidae, clear cuticular membrane located near the stridulatory apparatus; specular membrane.

missense mutation Gene mutation in which one amino acid is changed; the altered proteins may show some activity.

mitochondria n.pl.; sing. mitochondrion [Gr. mitos, thread; chondros, grain] Sausage-shaped structures in the cytoplasm of animal and plant cells.

mitogen n. [Gr. mitos, thread; genos, birth] An agent that stimulates a cell to undergo mitosis.

mitosis n.; pl. -ses [Gr. mitos, thread] The division and separation of chromosomes during cell division, involving the longitudinal splitting of each chromosome resulting in two equal sets of daughter chromosomes. mitotic a.

mitosome n. [Gr. mitos, thread; soma, body] A body arising from the spindle fibers of the preceding mitosis; spindle remnant.

mitraria larva (ANN: Polychaeta) Post-trochophore larva of Owenia with three hypertrophied setae for defense or floatation.

mixed nerve A nerve with both motor and sensory fibers.

mixed nest (ARTHRO: Insecta) A nest inhabited by two or more species of social insects with intermingling between adults and broods. see compound nest.

mixocoel n. [Gr. mixis, mingling; koilos, hollow] (ARTHRO) The adult body cavity (not a true coelom) derived from a blas-tocoel and secondary body cavities that functions as a hemocoel.

mixonephridium n. [Gr. mixis, mingling; nephros, kidney] (ANN: Polychaeta) A type of nephromixium in which the nephridium and coelomoduct are combined into a single organ having both excretory and genital functions.

mixoploidy n. [Gr. mixis, mingling; aploos, onefold; eidos, like] Having cells with different chromosome numbers in cell populations.

mnemotaxis n. [Gr. mneme, memory; taxis, arrangement] Movements in which memory plays a part.

mode n. [L. modus, measure] The most frequent value of any measurable characteristic in a population.

modifer genes Genes that affect the phenotypic expression of genes at other loci.

modification n. [L. modus, measure; facare, to make] Any variation caused by non-genetic factors.

modioliform a. [L. modiolus, a small measure or drinking vessel; forma, form] 1. In the form of a nave or hub of a wheel; more or less globular with truncated ends. 2. (MOLL: Bivalvia) Beaks are not terminal and anteroventral region forms a slight bulge; shell shaped like the genus modiolus .

modulation n. [L. modulare, to measure] 1. Alteration in cells by environment without change in their basic character. 2. Interactive modification of cells during development.

moiety n.; pl. -ties [L. medius, the middle] 1. One of two equal parts. 2. An indefinite portion.

mola n. [L. mola, mill] (ARTHRO: Insecta) In Coleoptera, the thickened and enlarged basal part of the internal ridge of the mandible used for grinding. see molar lobe.

molar a. [L. mola, mill] 1. Adapted for grinding. 2. (ARTHRO: Crustacea) Pertaining to the grinding surface on the inner edge of the mandibles or jaws.

molar lobe (ARTHRO: Insecta) The proximal lobe of the mandibles used for chewing or grinding. see mola.

molar process (ARTHRO: Crustacea) The grinding portion of the gnathal lobe of the mandible; pars molaris.

molecular biology The study of biological phenomena in terms of the physiochemical properties of molecules in a cell.

molecular genetics The study of genetics at the level of mole cules.

molecules n.pl. [L. dim. moles, mass] The small particles into which any substance can be divided without chemical change.

Mollusca n.; pl. mollusks, molluscs [L. molluscus, soft] A phylum of invertebrates with a soft unsegmented body and usually covered with a double or single shell, or having an internal shell; includes snails, chitons, tusk shells, bivalves, limpets, squids, octopi, etc.

molluscicide n. [L. molluscus, soft; caedere, to kill] An agent that kills snails.

molt, moult n. [L. mutare, to change] The periodic process of loosening and discarding the cuticle, accompanied by the formation of a new cuticla in the process of growth; may be divided into two distinct processes: apolysis and ecdysis. see pharate.

molting fluid 1. Often undetermined fluid that causes the loosening of the old cuticle. 2. (ARTHRO: Insecta) A fluid containing chitinase and proteinase that digests the unsclerotised cuticle (except the ecdysial membrane).

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