Biology

What is the difference between Spiral Cleavage and Radial Cleavage?

Radial vs. spiral cleavage

The Difference between Spiral Cleavage and Radial Cleavage is described below with the help of a table to understand the real difference.

Difference between Spiral Cleavage and Radial Cleavage

Spiral & Determinate cleavage

Radial & Indeterminate cleavage

1. In this cleavage the line or planes of cleavage are not symmetrical (not one above the other) between poles. 1. In this cleavage, the planes of cleavage are symmetrical to the polar axis.
2. These planes are diagonal (cross) to the polar axis. So they produce unequal cells around the axis of polarity. 2. This cleavage produces tiers of the cells on the top of each other.
3. The role of all the blastomeres is determined in the formation of embryo. The fate of each blastomere is foretold. 3. The fate of each blastomere is not pre-determined.
4. Each blastomere cannot produce new complete embryo. 4. Any one blastomere can produce a complete embryo.
5. E.g. Annelida. 6. E.g. Echinodermata

 

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