1) Founder effect and genetic drift: Small colonizing population did not represent the original gene pool of the source population and was more likely to undergo genetic drift.

2) Natural selection

Explanation:

Evolution of the population of the finches with larger beaks might have occurred due to one of the following mechanisms:

a) Founder effect and genetic drift: Since the size of the colonizing population was small, it did not carry all the genes and their alleles present in the gene pool of the original population. The small population size made it more likely to evolve by any chance event.

b) Natural selection: The availability of different food types in the new habitat led to the natural selection of the larger beaks as the finches with larger beaks might have been able to better exploit the available food resources.

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3 years ago

How do plant cells react when they are placed in an environment with a lower water concentration than inside of the cell? A. Pla

polet [3.4K]

plant cells lose water.

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3 years ago

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in animal muscular movement is caused due to change in position of proteins how do you think movement will be brought about in t

Colt1911 [192]

Answer:

Movement will be brought about in touch me not plants by the action of various chemicals present at the base of the leaf stalk. 

Explanation:

The leaves of touch me not plant stay upright due to turgor pressure. It is exerted by the water present within its cells. This pressure applies force against the cell wall enabling the plant to remain stiff.

When there is an external disturbance , parts of the plant releases certain chemicals including potassium ions that causes water to diffuse out of cells. This releases the turgor pressure and causes the leaves to shrink. 

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3 years ago