Developmental Biology Final Exam Questions With Correct Answers

Developmental Biology Final Exam
Questions With Correct Answers

Gastrulation
In animal development, a series of cell and tissue movements in which the
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blastula-stage embryo folds inward, producing a three-layered embryo, the
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gastrula.




WHAT CELL GROUP IS RESPONSIBLE FOR FORMATION OF THE EMBRYO?
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epiblast




epiblast
the outermost layer of an embryo before it differentiates into ectoderm and
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mesoderm.
-most of these cells remain at the surface of area pellucida
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-embryo forms entirely from the
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primary hypoblast
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, During gastrulation in the chick embryo, a cellular layer that forms from cells that
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first delaminate from the anterior epiblast to form islands of disconnected cells
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and then migrate to form the primary hypoblast layer below the anterior epiblast.
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secondary hypoblast |




sheet of cells from the posterior margin of the blastoderm migrate anteriorly and
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pushes the primary hypoblast cells more anterior forming the
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hypoblast cells form: | |




-external membranes (yolk sac)
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-also needed for induction of epiblast cells(signal the migration of these cells)
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epiboly
cells that migrate as a sheet
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endodermal precursors from the epiblast | | | |




first cells that ingress through the primitive streak and into the blastocoel:
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endodermal precursors |