Refer embryology textbook Give short answer with diagrams for these questions General Embryology 1. Spermatogenesis 2. Oogenesis 3. Fertilisation and effect of fertilisation 4. Clevage and blastocyst 5. Gastrulation 6. Neurulation 7. Neural crest cells 8. Somites 9. Intra embryonic mesoderm 10. Placental development with anomoly 11. Twinning