Biology 3338A Lecture Notes - Blastula, Chordin, Notochord
3 Apr 2014
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Recap: -catenin at the bottom of the egg with micromeres, determines posterior, vertebrate need a dorsal area sperm entry point = anterior, opposite is the posterior; Looking at the side of an embryo; there is no blastocoel cavity yet but there is something called a marginal/equitorial region. The top is animal, bottom is vegetal sperm will only fertilize one half. Sperm fertilization occurs on the anterior side; opposite will be posterior. Dorsal forms across the animal half and ventral is on vegetal half. Gastrulation will start at the marginal zone stage 8 is before gastrulation, stage 9 is when gastrulation starts. Transcription starts and dorsal and germ layers will form. Animal cap above the blastocoel cavity; if cultured alone, it will remain ectoderm. Add endoderm to ectoderm, endoderm will induce animal cap and form mesoderm. Organizer: organizes dorsal and form dorsal structure (vertebrate column) Different parts of the embryo have different functions.
