1. Biology 6 Practical Exam
Embryology Pics
Biology 6 Practical Exam

2. Sea Urchin Cleavage Zygote  2 celled  4 celled  8 celled

3. Sea Urchin Morula blastomeres

4. Sea Urchin Blastula

5. Sea Urchin Gastrula

6. Frog – Early Blastula

7. Frog Blastula
(future)

8. Frog Blastula A = anterior P = posterior
area of mitosis
blastocoel
cortical layer
area of invagination (opposite area of sperm entrance
A = anterior
P = posterior

9. Frog – Early Gastrula ectoderm Dorsal yolk plug Archenteron Ventral
endoderm
ectoderm

10. Frog – Late Gastrula Ectoderm Endoderm Mesoderm Blastocoel Archenteron
Dorsal lip of blastopore
Blastopore
Ventral lip of blastopore
Yolk plug
A = anterior
P = posterior

11. Frog Neurula

12. Frog Neurula Neural folds Neural crest cells Ectoderm Endoderm
Ventral mesoderm/lateral plate mesoderm
Notochord
Dorsal mesoderm/paraxial mesoderm
Archenteron

13. Starfish Development 4 celled 8 celled Blastula Early gastrula
Late Gastrula