Across
- 3. What kind of information does hox genes provides within the embryo?
- 5. These regulatory genes manage parts of the genetic program controlling structural genes.
- 8. These cells are specialized to secrete a product.
- 9. It is the embryonic development of an organism.
- 12. A specialized chorioallantoic placenta over the embryo for exchange of nutrients and gases.
- 14. It means bone formation.
- 21. The process by which the embryo forms a distinct endodermal tube that constitutes the early gut.
- 22. Ontogeny recapitulates ______.
- 24. Some characterize this as reverse recapitulation.
- 25. It consists the rest of our bones including pelvis, shoulder blades, limbs, etc.
- 28. It includes bones divided into skull, vertebral column, and thoracic case regions.
- 29. Vertebrates whose embryos possess extraembryonic membranes.
- 31. Neurulation means ____ and formation.
- 33. This is where osteocytes are found.
- 34. Features grow at a slower rate, compared to their rate in an ancestor.
- 35. When the first formative bone to appear is nonlamellar, it is called immature bone or _____ bone.
- 36. He stated that each embryo, instead of passing through stages of distant ancestors, departs more and more from them.
- 38. The law that states an animal embryo undergoes a replay of stages during development of its species' past evolutionary forms.
- 39. Exocrine gland can be tubular or ______.
Down
- 1. Formative germ layers differentiate into proper tissues through the process of what?
- 2. The pole where the prominent haploid nucleus resides.
- 4. Some features of ancestral embryos are retained in embryos of descendants.
- 6. The cell resulting from early cleavage divisions of the ovum is called?
- 7. Overactivation or underactivation of homeotic genes can lead to what?
- 10. Cells which are found in cartilage connective tissue.
- 11. A composite structure formed in part from tissues of the fetus and in part from tissues of the mother.
- 13. A process wherein various inorganic ions are deposited in the organic matrix of tissues to harden them.
- 15. The loss of physical vigor and reproductive ability.
- 16. It stimulates the other germ layers to form parts of organs.
- 17. A feature appearing late in development, relative to its time of appearance in an ancestor.
- 18. A specialized connective tissue in which calcium phosphate and other organic salts are deposited in the matrix.
- 19. Secretes the inner layer of dentin that also arise from neural crest cells.
- 20. Vertebrates laying eggs encapsulated in such shells or other tertiary egg envelopes are called?
- 23. The change in time at which a characteristic appears in the embryo relative to its appearance in a phylogenetic ancestor.
- 26. The fluid-filled body cavity formed within the mesoderm.
- 27. It is the act of giving birth via viviparity.
- 30. Gastrulation means ____ and formation.
- 32. The study of developmental events above the level of the genes.
- 37. It is formed by fibrous connective tissues and cartilage usually called as joint.
- 40. It means within or from cartilage.This bone development produces cartilage.