Gastrulation Process in Biology
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Questions and Answers

During gastrulation, what is the primitive streak?

  • A thickened axial band of cells in the caudal half of the embryo (correct)
  • The shallow primitive groove flanked by 2 primitive folds
  • The migration of the superficial cells of the epiblast through the primitive streak
  • The transformation of blastula to gastrula by formation of three germinal layers

    • What is the process of delamination during gastrulation?

  • The transformation of blastula to gastrula
  • The staining of specific areas of cells with non-toxic dyes
  • The formation of the hypoblast (endoderm) from the lower layer of the germinal disc (correct)
  • The migration of cells through the primitive streak to occupy a new position

    • What is involution during gastrulation?

  • The formation of the primitive streak in the embryo
  • The migration of the superficial cells of the epiblast
  • The transformation of blastula to gastrula by formation of three germinal layers
  • The migration of cells through the primitive streak to occupy a new position (correct)

    • What does gastrulation involve?

    <p>Transformation of blastula to gastrula by formation of three germinal layers</p> Signup and view all the answers

    Where does gastrulation occur in vertebrates?

    <p>Inner cell mass of the ova in mammals or the blastoderm of the ova in birds</p> Signup and view all the answers

    What do blasula-maps reveal about vertebrates?

    <p>They show a fundamentally similar pattern in all vertebrates</p> Signup and view all the answers

    During embryonic development, which cells form the ectoderm?

    <p>Cells that migrate laterally between the already formed endoderm and the superficial layer of the epiblast</p> Signup and view all the answers

    What is the function of the notochord during embryonic development?

    <p>Development of the primitive backbone (axial skeleton)</p> Signup and view all the answers

    Which layer forms the fetal membranes in mammals and birds?

    <p>Extraembryonic ectoderm</p> Signup and view all the answers

    From which cells does the notochord originate?

    <p>Proliferating cells of the primitive pit</p> Signup and view all the answers

    What do the fetal membranes offer the embryo?

    <p>Protection, nourishment &amp; way of excretion</p> Signup and view all the answers

    What does organogenesis mean?

    <p>Formation of the organs</p> Signup and view all the answers

    Which layer forms the yolk sac in birds?

    <p>Endoderm &amp; mesoderm</p> Signup and view all the answers

    What happens to the absorbed yolk sac at hatching in birds?

    <p>It becomes dry and is absorbed by the embryo</p> Signup and view all the answers

    Which layer together with somatic mesoderm forms somatopleure?

    <p>Somatic mesoderm</p> Signup and view all the answers

    What forms some cellular components of the born organism?

    <p>The notochord</p> Signup and view all the answers

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