Read each example and identify it with one of the mechanisms that influence gene pools. a zebra migrates to join a different herd of zebras. competition for sunlight leads to taller trees. the dna of a snake changes to make its venom stronger. a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

The correct answer for the given mechanisms influencing gene pool are the mechanisms of evolutionary change, which are described as follows-

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.

Changes in genes leads to changes in a population.

Gene is the unit of inheritance contained in the chromosomes. Genes are passed on from parents to offspring and control diverse traits in organisms. Certain occurrences change the traits of organisms by influencing the gene pool.

The following are changes in the gene pool that corresponds to the observations below;

Gene flow is said to occur when members of population migrate to a different location and interbreed with another population of the same species resulting in new combination of genes.

According to Charles Darwin, organisms that are most capable of surviving in their environment live long enough to reproduce and  pass on of these favorable traits to their offspring. This explains why competition for sunlight leads to taller trees.

Mutation refers to an alteration that occurs in the DNA that makes up gene leading to the appearance of a new trait in the population. In this case, the stronger venom results from alterations in the DNA. This is genetic mutation.

Genetic drift refers to changes in the gene frequency resulting from chance events (such as fire outbreak) which leads to the disappearance of particular genes because individuals die or fail to reproduce.

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