monophyletic theory — noun : a theory in physiology: all the cellular elements of the blood derive from a common stem cell compare polyphyletic theory … Useful english dictionary
monophyletic — 1. Having a single cell type of origin; derived from one line of descent, in contrast to polyphyletic. 2. In hematology, relating to monophyletism. [mono + G. phyle, tribe] * * * mono·phy·let·ic .män ō fī let ik … Medical dictionary
theory — A reasoned explanation of known facts or phenomena that serves as a basis of investigation by which to seek the truth. SEE ALSO: hypothesis, postulate. [G. theoria, a beholding, speculation, t., fr. theoros, a beholder] adsorption t. of narcosis… … Medical dictionary
polyphyletic theory — n a theory in physiology: the several cellular elements of the blood originate in two or more distinct stem cells compare MONOPHYLETIC THEORY * * * the theory that the various blood cells have their origin from two or more types of stem cells. Cf … Medical dictionary
polyphyletic theory — noun : a theory in physiology: the several cellular elements of the blood originate in two or more distinct stem cells compare monophyletic theory … Useful english dictionary
unitarian theory — monophyletic t … Medical dictionary
Flying primates theory — The flying primates theory conjectures that megabats, a sub group of Chiroptera (also known as flying foxes), form an evolutionary sister group of Primates. This theory was proposed by Australian neuroscientist Jack Pettigrew in 1986 [cite… … Wikipedia
dualistic theory — a variant of the polyphyletic theory that holds that blood cells arise from two distinct types of stem cells, the myeloblasts and lymphoblasts. Cf. monophyletic t. and trialistic t. Called also dualism … Medical dictionary
trialistic theory — a variant of the polyphyletic theory that holds that blood cells arise from three distinct types of stem cells, the myeloblasts, lymphoblasts, and monocytes. Cf. dualistic t. and monophyletic t. Called also trialism … Medical dictionary
Palaeontology — Palæontology † Catholic Encyclopedia ► Palæontology (logos ton palaion onton) Palæontology, or the science of fossils, deals with extinct or primeval animals and plants. It treats of their characteristics, classification, life and … Catholic encyclopedia
