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Unformatted text preview: Sea Urchin Terms Micromere – small cells created by asymmetrical cleavage- fours small cells generated by the fourth cleavage at the vegetal pole when the vegetal tier of the sea urchin embryo undergoes an unequal equatorial cleavage macromere – larger cells generated by asymmetrical cleavage- four large cells generated by the fourth cleavage when the vegetal tier of the sea urchin embryo undergoes an unequal equatorial cleavage mesomere – eight cells generated in the sea urchin embryo by the fourth cleavage when the four cells of the animal tier divide meridionally into eight blastomeres, each with the same volume blastomeres – a cleavage-stage cell resulting from mitosis veg2 cells – produce cells that can populate endoderm coelom, or non-skeletogenic mesenchyme blastocoel – a fluid-filled cavity that forms in the animal hemisphere of early amphibian and echinoderm embryos, or between the epiblast and hypoblast of avian, reptilian, and mammalian blastoderm-stage embryos blastula – early-stage embryo consisting of a sphere of cells surrounding an inner fluid-filled cavity, the blastocoel...
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This note was uploaded on 03/27/2012 for the course ZOOLOGY 470 taught by Professor Hardin during the Spring '12 term at University of Wisconsin Colleges Online.
- Spring '12