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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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396Maggenti and Gardnerprimitive streak.germ cells A reproductive cell in a multicellular organism. seesomatic cells.germiduct n. [L. germen, bud; ducere, to lead] (PLATY: Trematoda)The oviduct.germigen n. [L. germen, bud; Gr. genos, <strong>of</strong>fspring] (PLATY:Trematoda) The ovary.germinal a. [L. germen, bud] Pertaining to a germ cell or embryonicstructure. see soma.germinal cell Cells which produce gametes through meiosis,i.e., oocytes in females, spermatocytes in males; products<strong>of</strong> the germinal primordium.germinal disc see germ bandgerminal layers Primary cell <strong>of</strong> the embryo: ectoderm, mesoderm,and endoderm, from which tissues and organs <strong>of</strong> theadult are formed; germ layer.germinal mutations Genetic alteration in cells destined to becomegerm cells.germinal spot The nucleolus <strong>of</strong> an ovum.germinal streak The primitive streak. see germ band.germinal variations A variation caused by some modificationin the germ cells.germinal vesicle The diploid nucleus <strong>of</strong> a primary oocyte beforeformation <strong>of</strong> polar bodies.germinal zone That part <strong>of</strong> an ovarial or testicular tube wherethe oogonia or spermatogonia divide.germ layer see germinal layersgermogen n. [L. germen, bud; genes, born] (MESO: Rhombozoa)The central part <strong>of</strong> an infusorigen in the development<strong>of</strong> an axoblast.germovitallarium n.; pl. -vitellaria [L. germen, bud; vitellus,yolk] (PLATY) Having the ovary differentiated into yolk- andegg-producing regions.germ plasm Genetic material which forms the physical basis <strong>of</strong>inheritance and is passed from generation to generation.

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