Presentation is loading. Please wait.

Presentation is loading. Please wait.

Animal Development. Fertilization Cleavage Gastrulation Organogenesis Specialized adaptations.

Similar presentations


Presentation on theme: "Animal Development. Fertilization Cleavage Gastrulation Organogenesis Specialized adaptations."— Presentation transcript:

1 Animal Development

2 Fertilization Cleavage Gastrulation Organogenesis Specialized adaptations

3 Fertilization

4 EGG CYTOPLASM

5 Fertilization EGG CYTOPLASM Vitelline layer (extracellular matrix)

6 EGG CYTOPLASM Vitelline layer Sperm-binding receptors Fertilization

7 Vitelline layer Sperm-binding receptors Fertilization Jelly coat

8 Vitelline layer Sperm-binding receptors Jelly coat Cortical granules Fertilization

9 Vitelline layer Sperm-binding receptors Jelly coat Cortical granules Fertilization Sperm head

10 Vitelline layer Sperm-binding receptors Jelly coat Cortical granules Fertilization Acrosome

11 Vitelline layer Sperm-binding receptors Jelly coat Cortical granules Fertilization Acrosome Actin fibers

12 Fertilization

13

14 Acrosomal reaction

15 Fertilization Acrosomal reaction

16 Fertilization Acrosomal processes bind to sperm-binding receptors

17 Fertilization Acrosomal processes bind to sperm-binding receptors

18 Fertilization Acrosomal processes bind to sperm-binding receptors

19 Fertilization Sperm and egg membranes fuse

20 Fertilization Sperm and egg membranes fuse

21 Fertilization Sperm and egg membranes fuse

22 Fertilization Sperm and egg membranes fuse

23 Fertilization FAST REACTION:

24 Fertilization FAST REACTION: Ion channels open up

25 FAST REACTION: Ion channels open up Sodium ions rush in Fertilization

26 FAST REACTION: Ion channels open up Sodium ions rush in Membrane depolarizes Fertilization

27 FAST REACTION: Ion channels open up Sodium ions rush in Membrane depolarizes Fertilization

28 CORTICAL REACTION: Fertilization

29 CORTICAL REACTION: Endoplasmic reticulum releases Ca 2+ ions Fertilization

30 CORTICAL REACTION: Endoplasmic reticulum releases Ca 2+ ions Ca 2+ triggers cortical granules to fuse with plasma membrane Fertilization

31 CORTICAL REACTION: Endoplasmic reticulum releases Ca 2+ ions Ca 2+ triggers cortical granules to fuse with plasma membrane Fertilization

32 CORTICAL REACTION: Endoplasmic reticulum releases Ca 2+ ions Ca 2+ triggers cortical granules to fuse with plasma membrane Contents are released into perivitelline space Fertilization

33 CORTICAL REACTION: Endoplasmic reticulum releases Ca 2+ ions Ca 2+ triggers cortical granules to fuse with plasma membrane Contents are released into perivitelline space Sperm-binding receptors are clipped Fertilization

34 CORTICAL REACTION: Endoplasmic reticulum releases Ca 2+ ions Ca 2+ triggers cortical granules to fuse with plasma membrane Contents are released into perivitelline space Sperm-binding receptors are clipped Fertilization

35 CORTICAL REACTION: Endoplasmic reticulum releases Ca 2+ ions Ca 2+ triggers cortical granules to fuse with plasma membrane Contents are released into perivitelline space Sperm-binding receptors are clipped Vitelline layer hardens Fertilization

36 This time you give the narration!

37 Fertilization

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63 Cleavage

64 Morula Blastula

65 Cleavage

66

67

68

69 Gastrulation

70

71

72 Specialized adaptations Chorion Amnion Yolk sac Allantois

73 Specialized adaptations

74

75

76

77 Vertebrate Embryonic Development

78

79

80

81

82

83

84

85

86

87

88 Fate Mapping Specific regions of the zygote become specific parts of the embryo

89 Fate Mapping Nonamniotic species:

90 Fate Mapping Nonamniotic species: Unevenly distributed cytoplasmic determinants in the egg establish body axes.

91 Fate Mapping Amniotic species:

92 Fate Mapping Amniotic species: Local environmental differences establish initial differences between cells and determine body axes.

93 Fate Mapping Amniotic species: Local environmental differences establish initial differences between cells and determine body axes. “Organizer” regions secrete signals molecules.

94 Fate Mapping Apical Ectodermal Ridge Progress Zone Zone Of Polarizing Activity

95 Fate Mapping Remove AER Normal AER Split AER or Extra AER added

96 Fate Mapping Swapping AER’s

97 Fate Mapping Adding extra ZPA Adding Retinoic acid bead.


Download ppt "Animal Development. Fertilization Cleavage Gastrulation Organogenesis Specialized adaptations."

Similar presentations


Ads by Google