Biology 2581B Study Guide - Quiz Guide: Western Clawed Frog, Symmetry In Biology, Pluteus
1 Jun 2020
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Document Summary
Sea urchins, frogs and chicks are all useful model organisms because they have large enough embryos that they are amenable to physical manipulation. This means that you can physically move tissue around because they are large, robust and resistant to infection. Sea urchins have radial symmetry as opposed to the bilateral symmetry seen in most organisms. After forming the late gastrula they hatch into a free floating pluteus larva and later undergo metamorphosis to become an adult that can stick to surfaces. This whole process, from the egg being laid, takes about 50 days. Sea urchin are relatively easy to grow in the lab using sea water so it"s easier in labs by the coast. A lot of research is done into the early blastomere stages using sea urchins. In a typical experiment a sea urchin embryo at the 4 cell stage is taken and separated into 4 single blastomeres.
