Gastrulation is the stage of development [A] when neural tube formation begins.
ID: 78823 • Letter: G
Question
Gastrulation is the stage of development [A] when neural tube formation begins. [B] that makes possible the inductive interactions that trigger differentiation and organ formation. [C] that follows the formation of the three germ layers. [D] that precedes cleavage. [E] that is marked by a dramatic increase in the rate of mitosis. During gastrulation in the frog embryo, cells of the outer layer migrate into the inner space of the blastula through the [A] archenteron [B] ventral lip blastopore [C] dorsal lip blastopore [D] primitive streak [E] trophopore A homeotic gene [A] represses gene transcription. [B] turns on the genes necessary for synthesis of proteins. [C] serves as a master control gene that functions during embryonic development by controlling the developmental fate of groups of cells. [D] produces a product that controls the transcription of other genes. [E] All of the choices are correct.Explanation / Answer
Ans. b. that makes possible the inductive interactions that trigger differentiation and organ formation.
Gastrulation is the stage of embryo development at which a gastrula is formed from the blastula by the inward migration of cells. It is the process where the blastula is transformed by massive movements of cells into an embryo with multiple tissue layers and visible body axes. The resulting spatial relationships between tissues make possible the inductive interactions that trigger differentiation and organ formation.
5 Ans C
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