Modified 4/5/08 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. Fusion of an egg cell and a sperm cell forms a(n) _zygote__? An egg containing a lot of yolk will typically undergo what kind of cleavage? What is the name of the innermost embryonic layer produced by gastrulation? The fruit fly life cycle stages between the egg and pupa are called __? What occurs between the instars of insect development? The initial cavity of the blastula is called the ___? Before activation of the egg, yolk granules accumulate in the ___vegetal____ pole. During early embryonic development, the solid ball of cells is called what? Orientation behaviors in which an animal is either attracted to or repelled by the stimulus? A rapid, stereotyped movement of the body or body part is a _reflex__?