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1. What did calcium ions do during fertilization in sea urchins?
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- 1. What would be the effects if metamerism is absent in annelids? 2. Account for the variety of environment occupied by annelids and relate them to their morphological and physiological adaptations.1. Do the blastomeres get bigger or smaller during the early stages of Sea Urchin development?6. Identify stage of development in the starfish embryo below.
- 16. In amphibian embryos, BMPs act on ectodermal cells in concert with Wnts to form the epidermis. What happens to ectoderm when both BMP and Wnt inhibitors are active?14. Name the stage of development in this fish embryo1.What is the relationship of prolactin to hatching egg naturally? 2.What is the relationship between relative humidity and temperature inside the incubator compartment? 3.How does relative humidity effect embryonic devslopment? 4.What will happened to the developing embryo if all vents in the incubator are closed?why?
- 1. What makes the egg the most vulnerable stage in the animals life cycle? 2. How can egg of many marine animals survive long hours sitting exposed to the sun?1. Which embryonic stage is the most developed/lastest stage? 2. Eggshell affords protection, so why must it also be porous?1. Compare and contrast the embryonic development of the starfish and the sea urchin.
- 3. A dextral snail will express nodal in? 4. Snail embryos with a sinistral coiling are? 5. The first mammalian cleavage is?4. Describe how the scales are arranged on the trunk & tail of a tilapia.5. Explain how the swim bladder controls buoyancy.1. What type of symmetry is displayed in the arthropods? 2. Do the arthropods exhibit cephalization?