C A ?? Macromeres 1st quartet -2nd quartet 3ed qvartet 1d 2d1 ld\' 2d 2d2 2d 2d2

Question

C A ?? Macromeres 1st quartet -2nd quartet 3ed qvartet 1d 2d1 ld' 2d 2d2 2d 2d2 id ld 1d 1d 3d 3d 4d 1D Figure 1. The spiral cleavage patterm. (A) Animal pole view of a generalized spiral-cleaving embryo. Arrows indicate the direction of cell divisions. (B) Schematic diagram of cell pole, bottom vegetal pole). Cells are named with the standard spiral cleavage notation, where superscript 1 is given 1d) to cells bom closer to the animal pole (e.g. 1d'), and superscript 2 I given to cells bom closer to the vegetal pole (e.g. divisions in the D quadrant in a lateral view (top: animal

Explanation / Answer

ans-3 this can be find out by taking two embryos, one consisting the 3D cells along with the 1C and 1A while the other having the 1C and 1A only. then the further growth should be observed if both the embryoes develop normally then we can interprete that tjhe 3D cells do not have any role in the formation of the eye but if organism having 3D cells develops normally but one which do not have 3d cells do not grow normally then this should be interpreted as 3D cells have role in eye formation.

ans-4 the common character shared between these three is that the blastocoel remain lying between the ectoderm and endoderm.

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