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- Observation of the development of embryos in sea stars shows the mesoderm forming pouches bulging from the archenteron to form the coelom. From this observation, you can predict that A. the cleavage of the embryo is radial. B. the adult animal will have bilateral symmetry. C. the mouth forms from the first opening in the gastrula. D. the animal is diploblastic.Which of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The trophoblast is a germ layer. c. The inner cell mass is a source of embryonic stem cells. d. The blastula is often a hollow ball of cells.An unidentified substance (or substances) released from the developing notochord causes the overlying ectoderm to form the neural plate. This phenomenon is known as (a) activation (b) determination (c) induction (d) implantation (e) mosaic development
- Internal and external fertilization differ in that species thata. produce an amniotic egg have internal fertilization.b. without an amniotic egg have external fertilization.c. produce live young have mammary glands.d. lay eggs are external fertilizersWhat is NOT true about embryo development? A. a morula is an earlier stage than a gastrula B. Gatrulation creates endoderm and ectoderm in most animals C. Mammal blastulas are called blastocysts due to the thickened area where the embryo develops D. diploblastic animals have mesodermThe outermost germ layer in a vertebrate gastrula is the____ . a. endoderm c. mesoderm b. ectoderm d. dermis
- The inner cell mass of a human blastocysta. gives rise to the chorion.b. gives rise to the placenta.c. gives rise to the embryo.d. consists of highly differentiated cells.What structural adaptation in chickens allows them to lay theireggs in arid environments rather than in water?(A) extraembryonic membranes(B) yolk(C) cleavage(D) gastrulationCharacteristics that evolved in birds to allow for flight includea. reptilian-like scales on the legs.b. a hard-shelled amniotic egg.c. internal fertilization.d. thin, hollow bones in the skeleton.
- During embryonic development, unique cell layers develop into specific groups of tissues or organs during a stage called ________. a. the blastula stage b. the germ layer stage c. the gastrula stage d. the organogenesis stageThe process forming the neural tube and plate via the intercalation of cells along the medial-lateral axis and extension along the anterior-posterior axis occurs is called? a. neurulation b. embryogenesis c. convergent extension d. morphogenesisResearchers searched for an activator of neural tissue formation. What is the real pathway for this developmental phenomenon? a. Neural tissue formation occurs via BMP inhibition by proteins secreted from the organizer. b. Noggin activates ectoderm to become neural tissue. c. Nodal activation induces mesoderm to make neural tissue. d. Beta-catenin is required for formation of neural tissue.
