![]() Includes reptiles, birds and mammals, which share a common ancestor.Īmplexus - form of sexual reproduction seen in frogs wherein the male grasps the female from behind and externally fertilizes the eggs as they are deposited.Īmpulla - upper region of the mammalian oviduct, near the ovary. One of the four amniote extraembryonic membranes derived from the somatopleure (combination of ectoderm and somatic mesoderm)Īmniote - higher vertebrate capable of terrestrial reproduction, and having an amnion during its development. Contrast with isometric growth.Īmniocentesis - prenatal diagnostic procedure in which amniotic fluid is withdrawn from amniotic sac in order to obtain fluid and fetal cells which are analyzed for metabolic and/or genetic disorders, and to test the maturity of the fetus' lungs.Īmnion - the innermost membranous sac enclosing the embryo of an amniote it becomes filled with amniotic fluid. It collects waste materials from the embryo, and as a part of the chorio-allantoic membrane can be a site of gas exchange.Īllometric growth or allometry - phenomenon whereby parts of the same organism grow at different rates. Found in amniotes, it is one of the four extraembryonic membranes ( chorion, amnion, allantois and yolk sac) that are adaptations of the terrestrial egg. (verb) - to form such a body or mass.Īlbumen - The 'white' of a bird's egg which provides both protein and water for the growing embryo.Īllantois - extra-embryonic membrane emerging as a sac from the hindgut's ventral wall formed from the splanchnopleure (combination of endoderm and splanchnic mesoderm). Also well known as a major component of the contractile apparatus of muscle cells (along with myosin).Īgglutination - the state of joining or clumping together by adhesion.Īggregate (noun) - collection of units or particles (e.g., cells) forming a body or mass. Fusion of the acrosomal vesicle with the plasma membrane of the sperm (in the "acrosome reaction") exposes receptors that bind to the egg surface and is necessary for fertilization.Īctin - protein which when polymerized forms microfilaments, part of the cytoskeleton and necessary for cytokinesis and other cellular functions. Expression of AChE can serve as a marker of skeletal muscle differentiation.Īcrosomal vesicle - membrane-bound organelle in the sperm head derived from the golgi apparatus the vesicle containing enzymes that digest proteins and complex sugars in the outer coverings of an egg. ![]() Experiments involving nuclear transplants among different Acetabularia species helped demonstrate the essential role of the nucleus in determining development of the organism.Īcetylcholinesterase (AChE) - enzyme that catalyzes hydrolysis of the neurotransmitter acetylcholine into acetate and choline. These organisms comprise an enormous single cell consisting of a cap, stalk and rhizoid and can be up to 10 cm in size. Also known as Calcimycin, Antibiotic A23187.Īblation - experimental removal or killing of some part of an organism for example, in experimental embryology, used to determine what effect absence of the structure will have on development of the remaining embryo.Īcetabularia - genus of unicellular marine green algae. Within definitions, words in bold are defined under their own heading within the glossary.Ī23187 - mobile-carrier calcium ionophore (allows Ca ++ ions to cross cell membranes) originally isolated as an antibiotic from Streptomyces chartreusensis. To limit the scope of the glossary, gene and protein names are not generally included (although there are a few). Some terms found below are no longer found in the current edition of the text (now the 11th),īut they remain in the glossary nonetheless. Typically the definitions are provided by the student and modified as necessaryīy the instructor. Please note that the definitions are often given to explain a word found in a particularĬontext found in our text and so may be somewhat narrowly or ![]() Therefore, it is no longer regularly updated. This online glossary was originally created in part because our text lacked one. Gilbert (now the 11th edition by Gilbert & Barresi), a glossary was finally Note that starting with the 9th edition of 'Developmental Biology' by S. This Biology 376 Glossary was begun in Fall 1995 by the Biology 212 class at Lafayette College, and continued to be developed each semester by the instructor and students each year. Developmental Biology Glossary Biology 376 - Developmental Biology Glossary, Fall 2017 ![]()
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