The formation of a wide, deep canyon causes a very large, genetically diverse plant population to split into two populations. the resulting populations are genetically similar to each other, and both are large (though smaller than the original population). little gene flow occurs between these populations, and environmental conditions differ on the two sides of the canyon. under these conditions, genetic differences between these populations are most likely to:
a) decrease over time as natural selection favors different alleles in each population.
b) increase over time due to increased gene flow between the populations.
c) increase over time as natural selection favors different alleles in each population.
d) decrease over time due to decreased gene flow between the populations.