In which type of animals does the placenta exist? What is its main function?
Why can the allantois be considered an adaptation to terrestrial life?
After the blastula stage what is the following stage of the embryonic development? How is the passage from blastula to the next stage called?
What is the function of the vitellus in the vertebrate egg? How are these eggs classified according to the amount of vitellus within them?
What are the animal pole and the vegetal pole of the vertebrate egg?
What are the main substances transferred from the mother to the fetus through the placenta and from the fetus to the mother?
What are the extra embryonic membranes present in vertebrates?
Are the extra embryonic membranes the same in all vertebrates?
Why can the amnion also be considered an adaptation to terrestrial life?
How is the yolk sac formed? What is the function of the yolk sac?
Is there exchange of cells between the mother and the fetus through the placenta?
How is the mesoderm (third germ layer) of triploblastic animals formed?
What is the cell division during the first stage of the embryonic development called? How is this stage characterized?
After the morula stage what is the next stage? What is the morphological feature that defines that stage?
What are histogenesis and organogenesis?