ROTATIONAL CLEAVAGE IN FERTILIZATION

ROTATIONAL CLEAVAGE IN FERTILIZATION

2.5.3.     Rotational cleavage: It is the type of random cleavage, cleavage furrow passes from any direction. In this cleavage, second cleavage onwards, the pattern of blastomere cleavage is different.

2.5.4.     Bilateral cleavage: In this type of cleavage, blastomeres produce by the first cleavage divided in the same pattern and this same pattern of the division followed by each blastomere pair produces by cleavage and thus blastomere produces the mirror image of each other.

2.5.5.     Superficial cleavage: cleavage occurs superficial due to center located yolk. In this type of cleavage, karyokinesis occurs without cytokinesis. In this type of cleavage pole cells are formed at the posterior pole. The pole cell becomes primordial germ cells and gives rise to gonads.


Next Previous