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Encyclopedia > Radial cleavage

Radial cleavage is a cleavage pattern characteristic of vertebrates and echinoderms, in which the spindle axes are parallel or at right angles to the polar axis of the oocyte. As oppsed to spiral cleavage, a cleavage pattern characteristic of such invertebrates as annelids and mollusks, in which the cleavage planes are oriented obliquely to the polar axis of the oocyte.


  Results from FactBites:
 
PlanetPapers - Differences In Animal Phyla (918 words)
Cleavage is the separating divisions that transform the zygote into a ball of cells.
Spiral cleavage means that the planes of cell division are diagonal to the vertical axis of the embryo.
In radial cleavage, the planes of cleavage are either perpendicular or parallel to the vertical axis of the egg.
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