Asmall group of individuals leave a larger population and colonize a new area that is physically separated from the original population. due either to chance or genetic drift, the genetic composition of the new colony differs from the larger population.

Hello. This question is incomplete. The full question is:

"A small group of individuals leave a larger population and colonize a new area that is physically separated from the original population. Due either to chance or genetic drift, the genetic composition of the new colony differs from the larger population. This is an example of ...

A) gene flow - B) a founder event - C) geographic isolation - D) allopatric speciation "

B) a founder event

Explanation:

The founding effect occurs when some individuals from a given population isolate themselves and establish a new population in another location, relatively distant from the original. This new population presents only a small portion of the genetic variety of the original population, and, because it has a small number of individuals, it provides the action of genetic drift, a process in which the frequencies of genes fluctuate at random, regardless of whether they are linked whether or not to adapt.

The populations formed by the founder effect are small and, therefore, are more subject to extinction processes than larger populations.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.