A small group of yellow violet plants becomes isolated from a larger yellow violet plant population. This results in a change in allele distribution within the isolated group. Which mechanism is responsible for this change?

Genetic drift is the mechanism responsible for this change.

Explanation:

In the field of ecology, genetic drift can be described as the changes which arise in the allelic frequencies of a particular population over time. Genetic drift occurs randomly and usually changes the existing gene variant of a population.

The phenomenon of genetic drift is described in this question as the isolation of a small group of yellow violet plants caused the allelic frequencies to change in the isolated group.  

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