The nucleus of a frog egg is destroyed by radiation and replaced by a nucleus from a differentiated gut cell of a tadpole. the resulting egg is activated and develops into an adult frog. are the results of this experiment more consistent with the regulative hypothesis or the mosaic hypothesis?

These results are more consistent with the Regulative Hypothesis.

Explanation:

In developmental biology, there are 2 major ways or strategies of development:

Mosaic development or Determinate, which is called that way basically because the instructions are mostly built in and what happens is highly independent of environment factors or conditions.  Regulative development or Indeterminate, where Instructions come mostly from outside and what happens is highly dependent on environment and what type of cells and factors are present in the media conditions. Instructions come from contact with other cells, diffusible signals from other cells, etc.

As a result, one would distinguish the two types of development by observing and manipulating experiments where you are figuring out how rigidly is the pattern of development set.

In this particular case, a nucleus from a frog egg is destroyed and replaced by a nucleus from a cell of the same species but already differentiated into a gut cell. Instructions for develop each biological structure are contained in the DNA, but which structure is actually being produced is a matter of cell differentiation and shaping. In terms of biology this means that, although every cell has the information to potentially build any structure (or differentiate into every cell type), the environmental factors are responsible for assuming a particular pathway of differentiation.

Thus, when a gut cell nucleus is put in the context (environment) of an egg, there may be certain factors produced by the egg that “switch on” genes and developmental programs within DNA from nucleus related to egg development and not to gut cell functions.  As a result, nucleus is induced to behave as a nucleus of an egg cell.

Consequently, the above mentioned example is related to an outside (or ambient) driven behavior, typical of a Regulative development program or response.

The troposphere gets warmer as altitude increases.

Where are the following