"John Gillespie has done the near-impossible, condensing the essence of population genetics into a very short book. The result is a little gem. The derivations are simple and clear, and often strikingly original. The minor gaps in the first edition are filled by this equally concise second edition. Population genetics is a complicated subject; only a person of Gillespie's depth of knowledge and insight could simplify without distorting." - James F. Crow, author of Genetics Notes "The book is coherently and logically structured and covers all the most important and incontrovertible aspects of population genetics... I recommend this as a good introductory book that can be used in both undergraduate and graduate courses." - Heredity "A well-developed, thoughtful, and classic book that has been tested and improved through many years in the classroom... A 'must' for anyone interested in plant or animal genetics." - Choice"