Chapter 5: Life History

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Across
  1. 4. A layer of bone matrix with its closely-packed collagen fibers aligned in parallel.
  2. 9. The shelled container in which the fetus is laid, as in reptiles, birs, and primitive mammals.
  3. 10. The outer cellular layer of the mammalian blastocyst.
  4. 11. Youngest stage of the embryo.
  5. 12. Tissue formation.
  6. 15. A vertebrate whose embryo is wrapped in an amnion.
  7. 17. Consisting of storage packets of nutrients that help support the growing needs of the developing embryo.
  8. 19. Meaning "live" and "birth".
  9. 21. Where the prominent haploid nucleus resides.
  10. 24. Evolutionary throwback; reappearance of a lost ancestral trait.
  11. 26. Pertaining to eggs that contain small quantities of stored yolk.
  12. 27. Meaning "egg" and "birth".
  13. 29. A firm but flexible special connective tissue.
  14. 30. The course of evolutionary change within a related group of organisms.
  15. 32. The process of establishing the main topographical regions and body axes in an embryo.
  16. 33. Meaning "nerve" and "formation".
  17. 34. A transport form of yolk performed in the liver of the female and carried in her blood.
  18. 35. Changes in an organism from zygote to death, alhough often focused on events from zygote to maturity.
  19. 39. Cells specialized to secrete a product.
  20. 40. The yolk can be evenly distributed.
Down
  1. 1. Meaning "beyond" and "form".
  2. 2. Pertaining to eggs with large quantities of stored yolk.
  3. 3. Spaces within the matrix.
  4. 5. Embryos that draw nutrients from the yolk of the ovum.
  5. 6. Ernst Haeckel's claim that ontogeny recapitulates phylogeny.
  6. 7. Synovial joint.
  7. 8. Organic salts are arranged in a regular and highly ordered unit.
  8. 13. Very long microvilli.
  9. 14. A single-celled lining of body cavities.
  10. 16. The act of giving birth via viviparity.
  11. 18. The act of laying eggs.
  12. 20. A process by which individal surface cells migrate inward to the interior of the embryo.
  13. 22. A specific type of mineralization involving calcium carbonates (invertebrates) or calcium phosphates (vertebrates) in the matrix of special connective tissue.
  14. 23. Release of the ovum from the ovary.
  15. 25. Concentrated at one pole.
  16. 28. Splitting of sheets of embryonic tissues into parallel layers.
  17. 31. Where the most yolk resides.
  18. 36. Organ formation.
  19. 37. The spreading of surface cells during embryonic gastrulation.
  20. 38. An abrupt transformation from one anatomically distinct stage (juvenile) to another (adult).