Q:

Regarding pattern formation:

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Regarding pattern formation:


  1. cells of upper and lower limb mesenchyme are equivalent; they have the same positional values
  2. full specification of position is not supplied all at once, but is built up from a series of items of positional information registered in the cell\'s \"memory\" at different times; i.e., positional information is supplied in quantal units
  3. both A and B
  4. neither A nor B

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B. full specification of position is not supplied all at once, but is built up from a series of items of positional information registered in the cell's "memory" at different times; i.e., positional information is supplied in quantal units

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