Invertabrates biology

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Across
  1. 1. occurs in coeloblastula
  2. 2. produced of early cleavage
  3. 3. organism can be split along at least one plane
  4. 7. plane that separates dorsal and ventral sides
  5. 9. in stereo blastula with holoblastic cleavage
  6. 17. without true tissues (sponges)
  7. 18. cylindrical, body parts around one main axis
  8. 19. ectoderm, endoderm and mesoderm
  9. 20. with true tissues
  10. 22. product of holoblastic cleavage
  11. 26. cell fates determined early missed cells not replaceable
  12. 27. important to define grades of complexity in organisms
  13. 29. strictly longitudinal transverse division
  14. 31. passes along axis of body, separates into left and right
  15. 32. mesoderm forms solid mass of tissue and sometimes small cavities
  16. 33. portions of the body specialized only 2 planes divide organism into perfectly similar halves
  17. 39. Ectoderm and endoderm only outside and inside but no middle
  18. 41. concentrated yolk, center
  19. 42. complete cell division most common in isolecithal eggs
  20. 43. occurs in coeloblastula, cells divide with cleavage planes
  21. 44. multicellular
Down
  1. 1. occurs in coeloblastula
  2. 4. concentrated yolk, vegetal pole
  3. 5. Sponges and polyps have _____ symmetry
  4. 6. organism whose body lacks an axis have the form of a sphere
  5. 8. no body axis or plane of symmetry
  6. 10. without true tissues (placozoans)
  7. 11. cell rates determined late
  8. 12. product of holoblastic cleavage
  9. 13. little yolk, uniform distribution
  10. 14. partisl cell division common in telolcithal eggs
  11. 15. ground plan or structural design, features shared by a group of organisms
  12. 16. regular arrangement of body structures relative to axis of the body
  13. 21. in discoblastula cells around disc edge divide rapidly
  14. 23. fluid filled cavity between gut and body wall
  15. 24. aggregation of cells with similar morphology and physiology that have a similar function
  16. 25. body parts oriented about axis that makes an anterior and posterior
  17. 28. any plane cutting across the main body perpendicular to the midsaggital plane
  18. 30. adults develop from embryos
  19. 34. fluid filled cavity between gut and body wall
  20. 35. undivided mass of yolk
  21. 36. embryonic tissue layers give rise to different cell types
  22. 37. multilayered post-blastula form
  23. 38. filled with non-cellular yolk
  24. 40. unicellular