If your on plato: Genetic diversity will decrease because existing alleles will be lost and few new alleles will be introduced.
Genetic diversity is difference in inherited traits within a species. In a population that has a small size, high genetic drift, and very little migration, genetic diversity will increase in the population over time.
Genetic variability within the species is referred to as genetic diversity. Its examples includes different breeds of dogs, variety of rose, varieties of mangoes, etc.
The reason of genetic diversity can be migration, mutation and recombination.
The population with small size, high genetic drift, and less migration causes mutation in genes and due to less migration the population will not move to alternative region, this will leads to increased genetic diversity.
Thus, in the given scenario, there will be an increase in genetic diversity over time.
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