Biology 3338A Lecture Notes - Lecture 12: Spindle Apparatus, Machismo, Tunicate
9 Jul 2016
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Each species follows a unique patter that bascially divides up the egg (the determinants etc . This is species specific. holoblatic= completely divide the egg, meroblastic= not completely divided (ie chick egg, its way too big, you don"t divide that whole yolk). Telolecethal; divisions that exclude the yolk/centrolecithal; yolk in the center. A chick has a large egg with a yolk in the middle. Again telolecital; the cells themselves don"t have any yolk, they are ontop of the yolk. Its meroblastic because you only cleaves bits of the cell on top (not including the yolk). So chick egg here is doing discoidal telolicethal meroblastic cleavage is what is happening here. Centrolecithal- basically what happens in syncitia (ie in a fly; you start off with a nucleus which divides, and you have lots of dna (many nuclei) inside a structre called syncytia and then you form cells).
