A group of people whose ancestors immigrated to North America 200 years ago have certain allele frequencies that differ significantly from those in surrounding populations in the United States. Which of the following is the most likely explanation for the difference in allele frequencies?
a. Mutationb. Independent assortmentc. Reproductive isolationd. Sex linkagee. Gametic isolation

c. Reproductive isolation

Explanation:

Reproductive isolation is a process whereby organisms of a species are unable to mate and reproduce successfully as a result of barriers such as physical barrier or being isolated from each other.  

When a subpopulation become isolated from its original population, the subpopulation would most likely not carry along all the copy of the genes in the gene pool  the main population. Over time this subpopulation might be acted upon by evolutionary forces which would make the allele frequency to change and become different from those of its original population, as gene flow is impossible between both isolated populations. This leads to diversity as both populations over time would differ from each other as they have become reproductively isolated.

The most likely explanation for the difference in allele frequencies is reproductive isolation.

a chain link fence because there so tiny even my albino donkey can't get out