Cnidarians (and ctenophores) are diploblastic animals. What is the fate of the ectodermal and endodermal cells in cnidarians? Answer this by keeping track of structures /Nssues /cells of “organs” that are derived from the ectoderm or from the endoderm or both and by which group/taxa. Is there a common pattern for all or are there variations?
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- Cnidarians (and ctenophores) are diploblastic animals. What is the fate of the ectodermal and endodermal cells in cnidarians? Answer this by keeping track of structures /Nssues /cells of “organs” that are derived from the ectoderm or from the endoderm or both and by which group/taxa. Is there a common pattern for all or are there variations?
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- What are the molecules being secreted by the organizer in a regional fashion such that the first cells involuting through the blastopore lip (the endomesoderm) induce head structures, whereas the next portion of involuting mesoderm (notochord) produces trunk and tail structures?germ layer present / levels of organization and coelom specimen type of animal based on number and organization of germ layer present (diploblastic, triploblastic) type of coelom (none, pseudocoelom, true coelom) scypha hydra dugesia ascaris earthworm How did the structural complexity change among phyla as the number of germ layers increased? Is there an advantage of having a mesoderm, why or why not?Briefly explain how radial symmetry and the lack of cephalization usually associated with it can have adaptive value for sessile animals and be favored by natural selection.
- Earthworm Cross Section (Annelid Cross Section) Describe each function in the earthworm cross-section: epidermis, seta, ventral blood vessel, ventral nerve cord, cuticle, coelom, dorsal blood vessel, etc. Also indicate which parts are derived from ectoderm, mesoderm, and from endodermDescribe the development of the notochord. Include the terms primitive pit, notochordal process, notochordal canal, neurenteric canal, notochordal plate, ectoderm, mesoderm, and endoderm in your descriptions. Include labeled diagrams in your description. With respect to the developing notochord, where is the cloacal membrane, allantois, embryonic ectoderm, embryonic endoderm, and embryonic mesoderm with reference to the developing notochord.Which of the following is a characteristic of the Phylum Echinodermata? O Organisms in the phylum Echinodermata are made of cells, not tissue. Organisms in the phylum Echinodermata exhibit five-part morphological symmetry. Organisms in the phylum Echinodermata are thought to be the first to develop nerves and muscles. O Organisms in the phylum Echinodermata exhibit multiple life stages.
- Sponges are also found in freshwater, though not as numerous as the marine varieties. One example of this group is Spongilla, which can grow in many different morphs. Spongilla and other freshwater sponges have developed specialized reproductive cells known as gemmules, allowing them to survive harsh environmental conditions. Why are most Spongilla green?Which of the following are mismatched? (a) endoderm; lining of the digestive tube (b) ectoderm; circulatory system (c) mesoderm; notochord (d) mesoderm; reproductive system (e) ectoderm; sense organsDifferentiate between Phylum Porifera and Clade Eumetazoa. -Poriferans are only haploid during their life cycle, whereas eumetazoans are diploid with haploid sex cells at various stages of their life cycle. -Poriferans have mobile gametes while eumetazoans do not. -Poriferans invert during their development whereas eumetazoans do not invert at any time during their life cycle. -The various cells types of Poriferans do not form permanent associations into true tissues during their life cycle, whereas Eumetazoa possess true, stable tissues. -Poriferans have only one kind of cell during their life cycle whereas Eumetazoa have many kinds of cells throughout their life cycle.
- 1 page: Describe the radiation in vertebrate forms from phylotypic stage by focusing on three groups of vertebrates and then tracing the development of several homologous features in each group. Connect specific embryological structures in the phylotypic stage to divergent morphological structures in the adults of each of these groups.Ecdysis is development of the epidermis from the ectoderm. molting of the exoskeleton. disintegration of the ectoderm. development of the ectoderm layer in the gastrula. the feeding tentacles of the Ecdysozoa.What is the destination of the notochord in vertebrates and in protochordates?