WEEK 9 - SAMPLE LAB EXAM QUESTION
- QUESTION:
Look at the stages in the embryogenesis of the seastar.
- Identify stage A.
Identify stage B.
- What is the importance of stage B to the animal's future development?
- ANSWER:
- A - blastula
B - gastrula
- As cells take up new positions during gastrulation, they may receive information from newly adjacent cells that influences their course of subsequent development. Gastrulation also establishes the three primary germ layers - ectoderm, endoderm and mesoderm. These germ layers have different developmental fates and form characteristic tissues and organs during later development.
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