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Full Definition of CLEAVAGE. 1. a: the quality of a crystallized substance or rock of splitting along definite planes; also: the occurrence of such splitting b: a fragment (as of a diamond) obtained by splitting. 2. : the action of cleaving: the state of being cleft. 3.
Determinate cleavage (also called mosaic cleavage) is in most protostomes. It results in the developmental fate of the cells being set early in the embryo development. Each blastomere produced by early embryonic cleavage does not have the capacity to develop into a complete embryo.he embryo forms a disc of cells, called a blastodisc, on top of the yolk. Discoidal cleavage is commonly found in monotremes, birds, reptiles, and fish that have telolecithal egg cells (egg cells with the yolk concentrated at one end).