Exercise 13: Animal Development

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Across
  1. 4. These cells do not form from any of the three layers.
  2. 5. A fertilized egg.
  3. 8. The process of a fertilized egg developing from a single cell to a free-living organism.
  4. 11. The first central cavity to form in development.
  5. 14. "End"
  6. 15. This type of animal does not form a shelled egg or a placenta.
  7. 18. The type of cleavage birds have.
  8. 19. cord The neural tube develops into the brain and _____ ____.
  9. 20. The digestive tract forms around this cavity.
  10. 23. When yolk is distributed equally throughout the egg.
  11. 24. In place of the yolk in mammals.
  12. 25. Lies ventral to the neural tube.
  13. 29. Extraembryonic membrane used for waste storage.
  14. 30. Latin for "mulberry".
Down
  1. 1. The "smallest" type of lecithal
  2. 2. The yolk of the frog egg is concentrated at this pole.
  3. 3. Our closest invertebrate relative.
  4. 6. Cleavage of only the animal pole.
  5. 7. "Toward the belly"
  6. 9. This stage ends with three layers of cells.
  7. 10. The echidna is an example of this.
  8. 12. The collective term for organisms that enclose the embryo in an amnion.
  9. 13. The "out" derm layer
  10. 16. The "inner" derm layer.
  11. 17. Instead of a ball, avian embryos cleave into this flattened mass.
  12. 21. In avian embryology this layer forms below the blastocoel.
  13. 22. The largest bony portion of the vertebrae.
  14. 26. "Whole"
  15. 27. An energy-rich material.
  16. 28. Frog eggs have a brown layer of pigment concentrated at this pole in the egg.