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Fertilized Egg “Laid” = Zygote

                      shell
                      membrane


                                  Chalaza
Air sac




                             Egg shell


          Zygote
Structure of Fertilized Egg
             Zygote
                                     Air sac




   Chataza

                      shell  Egg shell
                      membrane
Cleavage in Chick Embryo

          Cleavage 1                     Cleavage 2


Zygote                 Two Blastomeres                four Blastomeres


                                                                Cleavage 3,4,5


                             Area Opaca                                  Sixteen
                                                                         Blastomeres



                            Area Pellucida
                                                       Blastoderm
Gastrulation in Chick
                Yolk




                                    Blastoderm elogated


Blastodisc or
Blastoderm


                       blastocoel                              epiblast



                                                   hypoblast
Gastrulation in Frog
From Gastrula to Neurula
Three Germinal Layers in Chick Embryo




 Yolk sac




            Yolk

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Chick development