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TLS Online TPP Program

#Question id: 7241

If planaria are irradiated at a dosage that destroys nearly all neoblasts. Transplanting a single clonogenic neoblast in this planaria results:

#Unit 5. Developmental Biology
  1. From this neoblast, dividing progenitor cells formed, ultimately producing cell types of all germ layer origins and also restores the organism’s capacity for regeneration.
  2. From this neoblast, dividing progenitor cells formed, ultimately producing cell types of all germ layer origins but do not restores the organism’s capacity for regeneration.
  3. cNeoblasts are not essential for regeneration, so only dividing progenitor cells formed for all germ layers.
  4. From this neoblast, the organism restores their capacity for regeneration but dividing progenitor cells not formed.
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TLS Online TPP Program

#Question id: 7161

#Unit 5. Developmental Biology

What is especially exciting about research into regeneration in zebrafish?
TLS Online TPP Program

#Question id: 7162

#Unit 5. Developmental Biology

Is regeneration in Hydra similar to regeneration in vertebrates, or is it fundamentally different in some way?
TLS Online TPP Program

#Question id: 7163

#Unit 5. Developmental Biology

What statement is correct when comparing morphallaxis and epimorphosis?
TLS Online TPP Program

#Question id: 7164

#Unit 5. Developmental Biology

If an amphibian zygote is manipulated so that the first cleavage plane fails to divide the gray crescent, then ________.
TLS Online TPP Program

#Question id: 7165

#Unit 5. Developmental Biology

Embryonic induction, the influence of one group of cells on another group of cells, plays a critical role in embryonic development. In 1924, Hans Spemann and Hilde Mangold transplanted a piece of tissue that influences the formation of the notochord and neural tube, from the dorsal lip of an amphibian embryo to the ventral side of another amphibian embryo. If embryonic induction occurred, which of the following observations justifies the claim of embryonic induction?
TLS Online TPP Program

#Question id: 7166

#Unit 5. Developmental Biology

Just prior to the onset of gastrulation in an embryo, the "organizer" cells are specified. If you were to experimentally block the specification of these cells, what would you expect the result to be in the developing embryo?