Research on abnormal human hemoglobins (protein in blood that carries oxygen), has taught us about the inheritance, biochemistry, and distribution of these traits. This knowledge, coupled with mathematical research using computer models of population genetics, has enabled researchers to marry biological fact and genetic theory. This volume places medical understanding in an evolutionary framework. Using published data on the frequencies of abnormal hemoglobins in the world's populations, Livingston analyzes and interprets these frequencies in the light of world distribution of different forms...