![]() : holoblastic cleavage, which is characteristic of protostomes and is defined by placing the blastomeres of each upper tier above the cell junctions of the next lower tier in such a way that the blastomeres spiral around the embryo’s pole to pole axis. So, what exactly is spiral cleavage? Definition of spiral cleavage. Undifferentiated cells are the name given to these cells. ![]() Deuterostomes, on the other hand, undergo indeterminate cleavage, where cells are not yet pre-determined to develop into specific cell types at this early stage. Radial cleavage is a term that means “radial cleavage.” : holoblastic cleavage is a type of deuterostome that occurs when the blastomeres of each upper tier are placed directly over those of the next lower tier, resulting in radial symmetry around the embryo’s pole to pole axis.ĭo Deuterostomes also have spiral cleavage? Protostomes undergo determinate cleavage in addition to spiral cleavage. ![]() Spiral Cleavage and Radial Cleavage differ in that cleavage in which cell division planes are diagonal to the embryo’s vertical axis is known as Spiral Cleavage, while cleavage in which the cleavage planes are parallel or perpendicular to the embryo’s vertical axis is known as Radial Hereof.
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