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Early Development in Birds and Mammals

Early Development in Birds and Mammals
14問 • 2024-05-12
  • Via Alarcon
  • 通報

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    問題一覧

  • 1

    What type of cleavage occurs in reptiles and birds?

    Discoidal meroblastic cleavage

  • 2

    Where does gastrulation begin in chick embryos?

    Area pellucida

  • 3

    What is the primitive streak in chick embryos derived from?

    Epiblast cells

  • 4

    What is formed as the primitive streak extends rostrally in reptiles and birds?

    Hensen's node

  • 5

    What would the cells migrating out of Hensen's node become?

    Prechordal mesenoderm

  • 6

    What follows the migration of prechordal mesoderm cells during development in reptiles and birds?

    Head process and notochord cells

  • 7

    What would the cells migrating out of Hensen's node become?

    Prechordal mesenoderm

  • 8

    What roles do the prechordal plate and chordamesoderm play in the development of reptiles and birds?

    Induction of forebrain and midbrain formation, respectively

  • 9

    What would happen to the cells that migrate laterally through the primitive streak?

    Become mesoderm cells

  • 10

    How do the primitive streak and gravity contribute to the establishment of the dorsal-ventral axis in bird development?

    Gravity helps determine the position of the primitive streak, which establishes the dorsal-ventral axis

  • 11

    How is the left-right axis formed in bird development?

    Expression of Nodal protein on the left side of the embryo

  • 12

    What role does the migration of the hypoblast play in the development of the embryo and the formation of the primitive streak?

    Promotion of cell movements during formation of the primitive streak

  • 13

    What is a characteristic of mammalian cleavage?

    Holoblastic rotational cleavage

  • 14

    What is the structure that forms after the blastomeres undergo compaction in mammals?

    Blastocyst