| 1. | The one exception is the anterior portion of the dorsal blastopore lip.
|
| 2. | Mesentoblasts are found in the blastopore area between the endoderm and ectoderm.
|
| 3. | Hence, primitive streak is analogous to the blastopore lip in amphibian gastrulation.
|
| 4. | Two major groups of animals can be distinguished according to the blastopore's fate.
|
| 5. | Convergence and extension of these tissues squeezes the blastopore shut and simultaneously elongate the body axis.
|
| 6. | However, in bryozoans the blastopore closes, and a new opening develops to create the mouth.
|
| 7. | The entrance to this is known as the blastopore and it will later develop into the anus.
|
| 8. | In most animals, a blastopore is formed at the point where cells are entering the embryo.
|
| 9. | In deuterostomes the anus forms from the blastopore, while in protostomes it develops into the mouth.
|
| 10. | A transplanted blastopore lip can convert ectoderm into neural tissue and is said to have an inductive effect.
|
मोबाइल