Fish embryos go through a process called mid-blastula transition which is observed around the tenth cell division in some fish species.
32.
Combining the expression of transcription factors and locational positioning of the blastula cells can lead to the development of induced functional organs and tissues.
33.
A ball of cells characteristic of animals, the blastula, is ultimately produced in this manner, with a maximum of 256 cells.
34.
Mammals at this stage form a structure called the blastocyst, characterized by an inner cell mass that is distinct from the surrounding blastula.
35.
Dissection of " Tarebia granifera " showed blastula stage embryos in the brood pouches of snails as small as 8 mm shell height.
36.
The parts that are autotomised or the buds may develop directly into fully formed larvae or may develop through a gastrula or even a blastula stage.
37.
A common feature of a vertebrate blastula is that it consists of a layer of blastomeres, known as the blastoderm, which surrounds the blastocoele.
38.
The first multicellular hollow ball of stem cells, the blastula, separates into distinct germ layers during gastrulation-the ectoderm, mesoderm, endoderm.
39.
During gastrulation the cells of the blastula undergo coordinated processes of cell division, invasion, and / or migration to form two ( triploblastic ) tissue layers.
40.
Since the embryonic development of the blastula within egg is also very similar to that of echinoderms, this suggests a close phylogenetic link between the two groups.
