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animal devo 2

12/13

QuestionAnswer
what is the role of the notochord in organogenesis? inducts neural plate to start changing shape...eventually pinches off and forms neural core
neural crest cells migrate thorugh different areas and have unique fates
what is the role of somites in organogenesis develop into musculature tha tis connected to notochord and into vertebrae...somite for every segment
what is left of the notochord today? the disks between vertebrae
describe embryonic development in amniotes very similar to the frog but germ tissues extend beyond the embryo and develop into four extra embryonic membranes
what are the four extra-embryonic membranes amnion, allantois, chorion, yolk sac
where does cleavage occur in mammals and humans oviduct
what does cleavage rsult in in mammals blastocyst
two major populations of cells in blastocyst trophoblast and inner cellular mass
what does the epiblast turn into? extraembryonic mesoderm cells
what does the chorion derive from trophoblast
what is the yolk sac derived from? hypoblast
what plays a major role in pattern formation of the vertebrate limb inductive signals (positional information)
role of inductive signals instruct a cell where it is in respect to its body axes
apical ectodermal ridge one limb-bud organizer region - thickened ectoderm at bud's tip
zone of polarizing activity second limb bud organizer region - mesodermal tissue under the ectoderm where the posterior side of the bud is attached to the body
two limb bud regions AER and ZPA
Created by: nkjohnston1424
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