| Question | Answer |
| Ectoderm | Outer layer, gives rise to: CNS, epidermis of skin, nasal, lens and otic plasodes(nasal chambers, lens and inner ear) |
| Endoderm | Inner layer, gives rise to: epithelial lining of primitive gut, respiratory tract, associated mural glands, bladder, middle ear and auditory tube. Also to parenchymal cells of liver, pancreas, thyroid and parathyroid glands. |
| Mesoderm | Middle layer, gives rise to: urogenital, circulatory and supportive musculature and skeletal systems. |
| Neural Crest | Neural plate cells that break away to a dorso lateral point. Derivatives = PNS, pigment cells, bone cartilage and connective tissue in the head. |
| Hary Weinberg equation | P(squared) + 2pq + q(squared) = 1 |
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