A powerline 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:
a) members of a small population tend to die off more quickly, removing alleles from the gene pool.
b) gene flow increases in a new environment.
c) the new environment is different from the old, favoring natural selection.
d) by chance, the allele frequencies of the isolated sowbugs differed from those in the original population, and subsequent genetic drift caused further divergence from the original gene pool.
e) mutations are more common near a powerline.
Answer: d) by chance, the allele frequencies of the isolated sowbugs differed from those in the original population, and subsequent genetic drift caused further divergence from the original gene pool.
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