Animal Development. Fertilization Cleavage Gastrulation Organogenesis Specialized adaptations.
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Transcript of Animal Development. Fertilization Cleavage Gastrulation Organogenesis Specialized adaptations.
![Page 1: Animal Development. Fertilization Cleavage Gastrulation Organogenesis Specialized adaptations.](https://reader037.fdocuments.in/reader037/viewer/2022102702/56649cd55503460f9499c801/html5/thumbnails/1.jpg)
Animal Development
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Animal Development
Fertilization
Cleavage
Gastrulation
Organogenesis
Specialized adaptations
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Fertilization
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FertilizationEGG
CYTOPLASM
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FertilizationEGG
CYTOPLASM
Vitelline layer
(extracellular matrix)
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EGG CYTOPLASM
Vitelline layer
Sperm-binding receptors
Fertilization
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Vitelline layer
Sperm-binding receptors
Fertilization
Jelly coat
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Vitelline layer
Sperm-binding receptors
Jelly coat
Cortical granules
Fertilization
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Vitelline layer
Sperm-binding receptors
Jelly coat
Cortical granules
Fertilization
Sperm head
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Vitelline layer
Sperm-binding receptors
Jelly coat
Cortical granules
Fertilization
Acrosome
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Vitelline layer
Sperm-binding receptors
Jelly coat
Cortical granules
Fertilization
Acrosome
Actin fibers
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Fertilization
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Fertilization
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Fertilization
Acrosomal reaction
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Fertilization
Acrosomal reaction
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Fertilization
Acrosomal processes bind
to sperm-binding receptors
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Fertilization
Acrosomal processes bind
to sperm-binding receptors
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Fertilization
Acrosomal processes bind
to sperm-binding receptors
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Fertilization
Sperm and egg membranes
fuse
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Fertilization
Sperm and egg membranes
fuse
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Fertilization
Sperm and egg membranes
fuse
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Fertilization
Sperm and egg membranes
fuse
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Fertilization
FAST REACTION:
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Fertilization
FAST REACTION:•Ion channels open up
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FAST REACTION:•Ion channels open up•Sodium ions rush in
Fertilization
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FAST REACTION:•Ion channels open up•Sodium ions rush in•Membrane depolarizes
Fertilization
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FAST REACTION:•Ion channels open up•Sodium ions rush in•Membrane depolarizes
Fertilization
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CORTICAL REACTION:
Fertilization
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CORTICAL REACTION:•Endoplasmic reticulum releases Ca2+ ions
Fertilization
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CORTICAL REACTION:•Endoplasmic reticulum releases Ca2+ ions•Ca2+ triggers cortical granules to fuse with plasma membrane
Fertilization
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CORTICAL REACTION:•Endoplasmic reticulum releases Ca2+ ions•Ca2+ triggers cortical granules to fuse with plasma membrane
Fertilization
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CORTICAL REACTION:•Endoplasmic reticulum releases Ca2+ ions•Ca2+ triggers cortical granules to fuse with plasma membrane•Contents are released into perivitelline space
Fertilization
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CORTICAL REACTION:•Endoplasmic reticulum releases Ca2+ ions•Ca2+ triggers cortical granules to fuse with plasma membrane•Contents are released into perivitelline space•Sperm-binding receptors are clipped
Fertilization
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CORTICAL REACTION:•Endoplasmic reticulum releases Ca2+ ions•Ca2+ triggers cortical granules to fuse with plasma membrane•Contents are released into perivitelline space•Sperm-binding receptors are clipped
Fertilization
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CORTICAL REACTION:•Endoplasmic reticulum releases Ca2+ ions•Ca2+ triggers cortical granules to fuse with plasma membrane•Contents are released into perivitelline space•Sperm-binding receptors are clipped•Vitelline layer hardens
Fertilization
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Fertilization
This time you give the narration!
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Fertilization
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Cleavage
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Cleavage
Morula Blastula
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Cleavage
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Cleavage
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Cleavage
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Cleavage
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Gastrulation
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Gastrulation
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Gastrulation
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Specialized adaptations
Chorion
Amnion
Yolk sac
Allantois
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Specialized adaptations
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Specialized adaptations
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Specialized adaptations
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Specialized adaptations
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Vertebrate Embryonic Development
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Fate Mapping
Specific regions of the zygote become specific parts of the
embryo
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Fate Mapping
Nonamniotic species:
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Fate Mapping
Nonamniotic species:
Unevenly distributed cytoplasmic determinants in the egg establish body axes.
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Fate Mapping
Amniotic species:
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Fate Mapping
Amniotic species:
Local environmental differences establish initial differences between cells and determine body axes.
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Fate Mapping
Amniotic species:
Local environmental differences establish initial differences between cells and determine body axes.
“Organizer” regions secrete signals molecules.
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Fate Mapping
Apical Ectodermal Ridge
ProgressZone
Zone Of PolarizingActivity
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Fate Mapping
Remove AER
Normal AER
Split AER orExtra AER added
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Fate Mapping
Swapping AER’s
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Fate Mapping
Adding extra ZPA
Adding Retinoic acid bead
.