First published in 1998, John Gillespie's brilliant primer Population Genetics: A Concise Guide has been updated with new topics that have emerged . Keeping the concise format that made the book such a popular success, new sections have been added on molecular evolution, genetic drift, the stationary distribution, two-locus dynamics, and the evolution of selfing in nonrandom mating. Writing with verve, Gillespie explains both the theories and empirical evidence. The result is an intriguing revelation of how genes can be quantified and explained at the level of population. Whether one works on Drosophila in a laboratory setting or studies free-ranging populations, you will find that this book is an indispensable addition to your library.