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The outermost germ layer in a vertebrate gastrula is
the____ .
a. endoderm c. mesoderm
b. ectoderm d. dermis
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- The process of gastrulation forms the _______. a. blastula b. zygote c. organs d. germ layersDuring gastrulation, cells from the _____ layer of the bilaminar germinal disc migrate and form the three primary germ layers. a. notochord b. hypoblast c. epiblast d. mesoblastThe cells that pull the archenteron through the blastocoel in the sea urchin are _____ cells called mesenchyme Group of answer choices A. mesoderm B. endoderm C. meroblastic D. macrolecithal
- 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 stageEndoderm, Mesoderm, and Ectoderm are formed during ________. a. Gametogenesis b. Cleavage c. Gastrulation d. OrganogenesisOdontoblasts are derived from a. Ectoderm b. Endoderm c. Histiocytes d. Undifferentiated mesenchymal cells
- Label each tissue with the specific source germ cells: v Gastrointestinal tract A. Intermediate mesoderm v Superficial sensory organs B. Ectoderm v Notochord C. Endoderm D. Chordamesoderm v GonadsLayer A is called _____X________, and ______Y________ develops from this layer. Select one: a. X Y Ectoderm Nervous system b. X Y Endoderm Nervous system c. X Y Endoderm Lining of the digestive tract d. X Y Ectoderm Lining of the digestive tractWhich 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.
- Along the notochord, segmented blocks of tissue that give rise to muscles, vertebrae, and connective tissues are calleda. neural crests.b. morulas.c. primitive streaks.d. somitesEctodermal cells of the developing embryo give rise to_____________ . a. bone tissue b. the kidneys c. the lining of the urethra d. the epidermisIn the development of amniotes (reptiles, birds, mammals), the defining feature of gastrulation is/are the __________________________. Choose all possible answers. a. Blastopore b. Blastomere c. Blastocoel d. Primitive streak e. Epiblast f. Koller’s sickle