#Question id: 6960
#Unit 5. Developmental Biology
At the blastocyst stage during mammalian embryonic development, the specification of trophectoderm requires ________; whereas in inner cell mass _________activation is essential.
#Question id: 6962
#Unit 5. Developmental Biology
In which way is the organizer region of the sea urchin similar to that in frogs?
#Question id: 6963
#Unit 5. Developmental Biology
During early sea urchin development, which embryonic cells have similar organizer activity to that of amphibian Spemann organizer?
#Question id: 6964
#Unit 5. Developmental Biology
If embryos are disaggregated with chemicals or proteases, and the individual cells are mixed together in culture, what will happen?
#Question id: 6965
#Unit 5. Developmental Biology
what type of cleavage is used in frog embryos?
#Question id: 6966
#Unit 5. Developmental Biology
During gastrulation in the frog, the very first cells to move into the interior of the embryo through the blastopore come from the surface layer of cells in the marginal zone; they will become: