Biology, 05.09.2019 20:30 Elijah7934

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?

Answers: 2

Show answers

Answers

Answer from: Beast3dgar

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.

Answer from: Quest

We can plant more trees and plants.

Answer from: Quest

what are the awnser choices? i mean, without choices, it is an incompleat

Another question on Biology

Biology, 21.06.2019 20:00

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

Answers: 2

Answer

Biology, 22.06.2019 03:50

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

Answers: 1

Answer

Biology, 22.06.2019 04:20

Hybrid instruments that play sounds that are part sampled and part synthesized are known as:

Answers: 1

Answer

Biology, 22.06.2019 15:00

Ineed with a hypothesis my question is can seeds sprout in different locations?

Answers: 1

Answer

You know the right answer?

The nucleus of a frog egg is destroyed by radiation and replaced by a nucleus from a differentiated...