Need help explaining :( ty in advanced. will mark brainliest! The data table below illustrates the change that occurred in the frequency of phenotypes in an insect population over five years. What is the most probable explanation for this change over time?

Phenotype (genotype) Year 1 Year 5
Dark Brown (BB and Bb) 2500 900
Light Brown (bb) 300 3100

The adaptive value of allele b decreased.
The adaptive value of allele b increased.
The population of this insect species increased.
The population of this insect species decreased.

The correct answer is - The adaptive value of allele b increased.

Explanation:

In this given population of insects, there is an increase in the number of insects in the given time of five years as initially there were 2800 insects and after five years there are 4000 insects, however, it is not the most probable explanation for the change in the phenotype as phenotype change does not depend on the size of population alone.

In this case, there is a drastic increase in the number of the recessive allele in last five years that suggests that adaptive value is increased of recessive allele due to some environmental change or mutation in the gene.

natural selection

Explanation: