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From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer?
1What is the stage of the embryonic development in which these structures are formed? What are the destinations of the archenteron and of the blastopore?
1
In which type of animals does the placenta exist? What is its main function?
Classify the animals based on the germ layers in their embryonic development?
What is umbilical cord? And what are its functions?
What are the archenteron and the blastopore?
What are the functions of placenta?
What is the main function of placenta?
What are twins? Genetically what are the two types of twins that can be generated?
Explain foetal pole?
What is the chorioallantois membrane present in the embryonic development of reptiles and birds? How does this membrane participate in the energetic metabolism of the embryo?
How is the yolk sac formed?
What are the animal pole and the vegetal pole of the vertebrate egg?
What is the germ layer from which the coeloms originate?
What is coelom?
What is notochord?
What is gastrulation? How during gastrulation are the first two germ layers formed? Which are these germ layers?
