Review for the second hour exam, part twoWhat kind(s) or symmetry do each of the following have?
normal plutei as compared with plutei that develop from embryos separated at the two cell stage and at the four cell stage
the structure of normal flagellar basal bodies
N S Z # %
H I X 8 = : 0
Do all embryos break symmetry several times (which is simply a fact that one can observe, whether or not anyone can discover or even imagine mechanisms by which embryos break symmetry)?
True or false?: Reaction diffusion systems are (hypothetical?) mechanisms that are able to break displacement symmetry by using differences in diffusion rates to magnify tiny random irregularities in chemical concentrations.
True or false?: Any stage of embryonic development that succeeds in breaking displacement symmetry must have used some kind of reaction-diffusion system to accomplish this
True or false?: Locations of sperm entry are used by many species as a method for breaking what kind of symmetry.
True or false?: Kartagener's syndrome is evidence that human embryos break right-left reflection symmetry by means of the normal rotational symmetry of flagellar waves.
Please notice the irony that Driesch concluded that dilation symmetry of separated 2 and 4-cell embryos was evidence of control by super-natural mechanisms. (Instead of breaking dilation symmetry)
More questions will be added.