Depending mostly on the amount of yolk in the egg, the cleavage can be holoblastic (total or entire cleavage) ormeroblastic (partial cleavage). In the presence of a large amount of yolk in the fertilized egg cell, the cell can undergo partial or meroblastic cleavage. Two major types of meroblastic cleavages are discoidal e.g. birds and superficial e.g. arthropods.