. Journal of morphology. body size. Here the rate and duration of .cellgrowth and cell division are the most important factors in deter-mining body size. d. Blastomeres. In the early cleavage of the eggs of these gas-teropods the blastomeres are, cell for cell, the same, except forsize, in all the species, whatever the size of the egg may be. Thedirection of cleavage and its relation to the chief axis of the egg,the rhythm of cleavage and the relative sizes of daughter cells, theconstitution of the blastomeres, whether protoplasmic ordeuto-plasmic, and the ultimate destination of the individua
. Journal of morphology. body size. Here the rate and duration of .cellgrowth and cell division are the most important factors in deter-mining body size. d. Blastomeres. In the early cleavage of the eggs of these gas-teropods the blastomeres are, cell for cell, the same, except forsize, in all the species, whatever the size of the egg may be. Thedirection of cleavage and its relation to the chief axis of the egg,the rhythm of cleavage and the relative sizes of daughter cells, theconstitution of the blastomeres, whether protoplasmic ordeuto-plasmic, and the ultimate destination of the individual blastomeresis the same in all the species of Crepidula, (figs. 4 to 12). In allof them the ectomeres are separated from the entomeres as threequartets of micromeres, which contain most of the cytoplasm ofthe egg but no yolk (figs. 4 to 7); in all of them the mesomere(4c?) arises from the left-posterior macromere, and contains bothyolk and cytoplasm; in all species, the entomeres are the four BODY SIZE AND CELL SIZE 173.
Size: 1537px × 1626px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1, booksubjectphysiology, bookyear1912
