Page 6 - 11-Bio-10 Kingdom plantae

10. Kingdom Animalia eLearn.Punjab

Fig. 10.2 Patterns of embryonic development of coelom and of egg cleavage In protostomes and deuterostomes.

A spiral and determinate cleavage is that in which the lines or planes of cleavage are not symmetrical
between poles instead these are diagonal to the polar axis and produce unequal cells around the
axis of polarity and all the blastomeres have determined role to play in the formations of embryo.
The fate of each blastomere is foretold.
In radial and indeterminate cleavage the planes of cleavage are symmetrical to the polar axis and
produce tiers of cells on top of each other and the fate of each blastomere is not pre-determined.
In some anyone blastomere can produce a complete embryo.

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