Question

A power line cut has isolated 50 sowbugs from its original population of 15,000. after only five generations, the new population exhibits dramatic genetic differences from the original one, most likely because

Answer 1

The reason why the new population exhibits dramatic genetic difference from the original one probably by chance, the allele frequencies of the isolated sow bugs differed from those in the original population, and subsequent genetic drift caused further divergence from the original gene pool.