- progressive cleavage
- in the formation of spores within a sporangium, the production of a series of cleavage planes in succession, resulting first in formation of protospores and later in formation of sporangiospores.
Medical dictionary. 2011.
progressive cleavage
Look at other dictionaries:
cleavage — 1. Series of mitotic cell divisions occurring in the ovum immediately following its fertilization. SYN: segmentation (2). SEE ALSO: c. division. 2. Splitting of a complex molecule into two or more simpler molecules. SYN: scission (2). 3 … Medical dictionary
protospore — The initial product of progressive cleavage, in which a multinucleate spore is produced. [proto + G. sporos, seed] * * * pro·to·spore (proґto spor) the first product of progressive cleavage, a multinucleate mass of cytoplasm surrounded by… … Medical dictionary
sporangium — A saclike structure (a cell) within a fungus, in which asexual spores are borne by progressive cleavage. [L. fr. G. sporos, seed, + angeion, vessel] * * * spo·ran·gi·um spə ran jē əm n … Medical dictionary
animal development — Introduction the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by … Universalium
human embryology — ▪ biology Introduction the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth. The human body, like that of most animals, develops from a single cell produced by the union of… … Universalium
syndrome — The aggregate of symptoms and signs associated with any morbid process, and constituting together the picture of the disease. SEE ALSO: disease. [G. s., a running together, tumultuous concourse; (in med.) a concurrence of symptoms, fr. syn,… … Medical dictionary
plant development — Introduction a multiphasic process in which two distinct forms succeed each other in alternating generations. One form, created by the union of sexual cells (gametes (gamete)), contains two sets of similar chromosomes (diploid). At sexual… … Universalium
geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… … Universalium
France — /frans, frahns/; Fr. /frddahonns/, n. 1. Anatole /ann nann tawl /, (Jacques Anatole Thibault), 1844 1924, French novelist and essayist: Nobel prize 1921. 2. a republic in W Europe. 58,470,421; 212,736 sq. mi. (550,985 sq. km). Cap.: Paris. 3.… … Universalium
Christian democracy in the Netherlands — Part of a series on Christian democracy … Wikipedia
