Biology

The correct answer is: C.Different allele frequencies between populations.

Explanation:

The Hardy-Weinberg principle assumes that allele frequencies in a population remain constant over generations, and one of the key conditions for this is no migration. Migration (or gene flow) can alter allele frequencies by introducing new alleles into a population or removing alleles through emigration.

If there are different allele frequencies between populations, it suggests that migration is happening, which violates the Hardy-Weinberg assumption of no gen...