BIOL 200 Study Guide - Midterm Guide: Polymerase Chain Reaction, Cell Division, Chromatin
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BIOL 200 Full Course Notes
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Document Summary
Gastrulation: extensive and highly organized cell movements radically rearrange the embryonic cell into a structure called the gastrula. The frog blastula contains a uid- lled interior space called the blastocoel. The blastula of most animals contains a blastocoel. As gastrulation begins, an indentation forms on the outer surface. In frogs this invagination starts out as a slit that eventually forms a circular opening known as the blastopore. Cells from the surface move into the interior of the embryo through the blastopore, forming a tube that will become the gut or digestive tract. The movement of cells into the embryo ultimately results in the formation of the three germ layers. Ectoderm: outer coverings of the body and the nervous system. Mesoderm: muscle, most internal organs, connective tissue such as bone and cartilage. Endoderm: lining of the digestive tract and many organs that develop from the gut, such as the liver and lungs.
