Medical dictionary. 2011.
monophyletic theory — n a theory in physiology: all the cellular elements of the blood derive from a common stem cell compare POLYPHYLETIC THEORY * * * the theory that all forms of blood cells have their origin in a single type of cell, the blast cell (which develops… … 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
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
trialism — tri·al·ism (triґəl iz əm) trialistic theory; see under theory … Medical dictionary
