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1. Do the blastomeres get bigger or smaller during the early stages of Sea Urchin development?
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- 14. Name the stage of development in this fish embryo2. How does the size of blastomeres compare in size to the original fertilized egg?4. Into what cavity does the blastopore open? The gastrular slit? What becomes of each? 5. Explain the eccentric position of the early frog blastocoel. 6. Explain the changes in size and position of the frog blastocoel during gastrulation.
- 1. Compare and contrast the embryonic development of the starfish and the sea urchin. 2. Compare and contrast gametogenesis in starfish and sea urchin. 3. What is the significance of the formation of the blastocoel and blastoderm during blastulation? What physical processes initiates and accomplish the formation of the gastrula?1. Compare and contrast the embryonic development of the starfish and the sea urchin.1. Which embryonic stage is the most developed/lastest stage? 2. Eggshell affords protection, so why must it also be porous?
- 3. Describe the development of the amniotic cavity, the bilaminar embryonic disc, the yolk sacs (primary and secondary umbilical vesicles), the extraembryonic mesoderm, the extraembryonic coelom, and the connecting stalk.What is the distinguishing characteristic of each stage in the embryonic development of the sea urchin? Embryonic Stage Distinguishing characteristic 1. zygote 2. morula 3. blastula 4. gastrula 5. pluteus54. In protostomes and deuterostomes, the space between the endoderm and the ectoderm is important because: a) it provides a perfect environment that can be maintained for all the cells even if the outside environment change b) protostomes use their ectoderm to develop digestive organs inside it c) deuterostomes develop their brain from the mesoderm in this space d) the endoderm forms the immune system in this space, e) all are important.
- 5. name the developmental stage indicated a # 31. What are the differences between unfertilized and fertilized egg? 2. Differentiate miolecithal, medialecithal and megalecithal. What organisms exhibit these features?1. State the function of the following parts of the genus Romalea (grasshopper): antenna, tympanum, spiracles, ovipositor (female), gastric caeca, malphigian tubules, tracheae, air sacs What are the hairlike appendages called that anchor into the skin of annelids? What structures do earthworms have to help dispose of nitrogenous wastes? Briefly describe how earthworms reproduce and what structures are involved.