The constant dance of microevolution is driven by alleles, different versions of genes that determine traits. Sexual reproduction results in organisms inheriting a unique combination of genetic material from both parents, creating genetic diversity within a population. New alleles can appear through mutations or gene flow between populations. The dance of alleles will continue, introducing new traits and variations in the ongoing story of evolution. Evolution Talk is also a book! You can find links to Amazon, Barnes & Noble and others on the front page of EvolutionTalk.com, or call your local bookstore and ask them to order a copy.