How are the specific cell types patterned correctly? How does the flatwormtell the posterior blastema to become tail and the anterior blastema to become head?
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How are the specific cell types patterned correctly? How does the
tell the posterior blastema to become tail and the anterior blastema to become head?
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- Consider the process of organogenesis. a) Describe how coelom-status impacts the process of organogenesis. b) How do organs develop and where (in which cavity)? When does this process occur?What happens if the flagellum is missing?Which of the following is true about Sea urchin blastula formation and fate map? a) ectoderm that develops into the larval skin and neurons, is regularly produced by the vegetal half of the embryo. b) an1 layer generates cells that can enter either the ectodermal or endodermal organs of the larva. c) veg2 layer forms the endoderm, coelom (internal mesodermal body wall), and the non- skeletogenic mesenchyme. d) small micromeres differentiate into the PGCS e) large micromeres differentiate into the secondary mesenchyme cells
- Grantia Sponge Are the radial canals and the spongeocoel connected or seprate? IS the spongeocel a true coelom, a pseudocoelm, or neither? What is the direction of water flow in the sponge and are they multicellular? What functions do each of the different kinds of cells have? Are they diploblastic,triploblastic, or neither?Comparision between coleoptile and coleorhiza?What type of symmetry is seen in the roundworm? Does it exhibit cephalization? Ascaris is a parasite that swims constantly in human intestines. What structure protects the nematode from being digested? View the Trichinella slide. Trichinella is also a parasite. It can infect humans as well as other mammals like pigs, bears, and rodents. If untreated, it can lead to death.What mammal tissue does this roundworm infect?Draw a picture below of the Trichinella as viewed under the microscope. Although not mentioned on the website, if available view the live vinegar eel specimens. If there are no live specimens available, check out this you tube video instead: https://www.youtube.com/watch?v=UnjwvtFvyeQDescribe the movement of the vinegar eels.Do they have a complete or incomplete digestive system?
- How are the oral and anal cavities differentiated in the intact, adult earthworm? The anal cavity develops before the oral cavity. The anal cavity is at a farther distance from the clitellum than is the oral cavity. The anal cavity develops from the mesoderm and the oral cavity develop ectoderm. Both cavities develop at the same time during gastrulation and can not be differentiated in the adult. Both cavities develop at different times from the mesoderm and can not be differentiated in the adult unless it is cut open.What is the function of the notochord? What organisms possess notochords throughout their lives and what organisms have notochords but degenerate in their early development?Describe the feeding process of a sponge. Make sure to use the following vocabulary in your answer: spongocoel, choanocytes, phagocytosis. What are some possible functions of spicules and spongin? How are these sponge parts alike and different? Why is sexual reproduction beneficial for sponges (or other organisms)? When could asexual reproduction be beneficial?