the rapid mitotic division of the zygote with decrease in size of individual blastomeres and the formation of a morula. See also: cleavage (2).
cleav·age di·vi·sion
(klēv'ăj di-vizh'ŭn) The rapid mitotic division of the zygote with decrease in size of individual cells or blastomeres and the formation of a morula. See also: cleavage (1)