![]() ![]() Pigment line-The first visible sign on the surface of the amiphibian embryo that gastrulation is underway. The groove presumably results from the invagination producedīy apical construction, as well as the basal expansion of theīasal ends of the bottle cells, which forces nearby tissue to Groove-The groove formed as result of the formation of bottleĬells. One of the cells produced as the result of cell division, cleavage, In the animal half and yolk, where present, largely in the vegetalĪnterior-posterior axis - Body axis extending from the anterior to the posterior pole of a bilaterally symmetric embryo (or animal).īy the endoderm during gastrulation will later become the gutĪxial mesoderm -the mesodermal tissue that gives rise to the notochord and somites.īlastocoel- Fluid-filled cavity that forms in the embryo after the morula stage. Of substances along this axis, with pigment granules often concentrated In many eggs there is also a graded distribution During meiosis of the oocyte the polar bodies areĮxpelled at animal pole. Pole, with the animal-vegetal axis between the poles passing through To the nucleus is the animal pole, and the other is the vegetal Pole-In most animal oocytes the nucleus is not centrally placedĪnd its position can be used to define two poles. ![]() ![]() Injected with thyroid or pituitary gland extract.Īnimal cap-Pigmented animal hemisphere of the amphibian blastula. The neotenous,Īquatic axolotl will metamorphose into the terrestrial form if May retain the larval form, but can reproduce. Growth of cells, particularly bacteria and some cancer cell lines.Īxolotl (amphibian). From seaweed (Rhodophyceae) and used as an inert support for the ![]()
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