Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
What are the Stages of Embryonic Development? 1. Name the 5 major stages of embryonic development and explain why each stage is a significant milestone in development of animals. 2. Regarding embryonic cleavage and blastula formation: compare the rate of cell division at these stages indicate how yolk affects these stages in amphibians and birds draw the blastula stage of a sea urchin, frog, and bird (label the blastocoel in each) draw a mammalian blastocyst and explain how in differs from the blastula of the above animals (label the inner cell mass and trophoblast) 3. Regarding gastrulation: describe the general process of gastrulation and indicate how it establishes the animal body plan compare the process of gastrulation in the sea urchin vs. birds discuss why mammalian gastrulation occurs as in birds, even though mammalian eggs have no yolk explain the major change in genome expression that occurs around the time of gastrulation; why does this change occur at an earlier stage in mammals? 4. Describe the process of neurulation and indicate the structures that develop from the neural tube. 5. Explain the origin of neural crest cells and name a few structures that develop from these cells. 6. Indicate the origin and location of somites in the embryo, then name two structures that will develop from somites. 7. Name several organs and/or cell types that develop from the embryonic ectoderm mesoderm endoderm 8. Name the 4 extraembryonic membranes of bird and reptile embryos and explain the function of each (relative to embryonic development within an egg laid on land). 9. Describe how the above membranes have become adapted by mammals for development within the uterus. 10. Be able to define the following terms: blastopore germ layer primitive streak notochord neural fold cell differentiation placenta