37. Which statement about gastrulation is true Al in frogs, gastrulation begins

Question

37. Which statement about gastrulation is true Al in frogs, gastrulation begins in the vegetal hemisphere. IB] In sea urchins, gastrulation produces the notochord. [C] In birds, cells from the surface of the blastodisc move down through the primitive groove to form the hypoblast. ID) In mammals, gastrulation occurs in the hypoblast. [E] sea urchins, gastrulation produces only two germ layers. 38. The process of is the shaping of differentiated cells into the multicellular organism and its organs [A] determination [B] totipotency [C] morphogenesis [D] induction [E] competence 39. Primary germ layer that gives rise to sensory ganglia [A] ectoderm [B] endoderm [C] mesoderm [D] trophoderm [E] none of the above 40. If cells from the presumptive neural ectoderm of a frog gastrula are transplanted onto the surface of a second gastrula where skin would normally develop, the transplanted cells will still develop into tissues of the nervous system. From this experiment, we can say that the transplanted cells are [A] differentiated. [B] totipotent. [C] discontinuous. [D) determined. [E] endodermal.

Explanation / Answer

37 the correct answer is C

38 the answer is morphogenesis

39 answer is A

The ectoderm is the start of a tissue that covers the body surfaces. It emerges first and forms from the outermost of the germ layers. The ectoderm forms the central nervous system, the lens of the eye, cranial and sensory, the ganglia and nerves, pigment cells, head connective tissues, the epidermis, hair, and mammary glands.

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