From T.I.G.E.R.S. Preservation Stations, Barefoot Landing, Myrtle Beach, S.C. And Parrot Jungle Island, Miami, Fla. Why aren"t horses and donkeys the...

From T.I.G.E.R.S. Preservation Stations, Barefoot Landing, Myrtle Beach, S.C. And Parrot Jungle Island, Miami, Fla. Why aren"t horses and donkeys the same species? All members of a species that live in particular area at a given time. All of the alleles of a gene that exist in a population. Evolution = Change in the frequencies of alleles in a population over time. Why is the frequency of the sickle-cell gene different in North America versus Africa?