1. Animals ingest their food 2. Nervous tissue and muscle tissue, blastula stage 3. Hox genes regulate the development of body form. They’re highly conserved (they haven’t gone through a lot of evolutionary changes) 4. Flagellated protists, choanoflagellates 5. Deuterostomia – second mouth develops into the anus, a. Protostomia – first opening develops into the anus b. Diploblast – two germ layers (sponges and hydras) c. Triploblast – three germ layers d. Bilateral symmetry – divided into two halves e. Radial symmetry – symmetrical around a central axis 6. Gastrulation 7. Cleavage 8. Zygote undergoes cleavage to form a blastula (hollow ball), blastula undergoes gastrulation to form a gastrula a. During gastrulation, if the blastopore forms a mouth, then it’s a protostome b. If it forms an anus, then it’s a deuterostome 9. Germ layer – (mesoderm, endoderm, ectoderm) a. Archenteron – gap created by gastrulation b. Coelom – fluid filled cavity formed in the mesoderm
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