Readable, well organized, and easy to use, this outstanding encyclopedia signifies a timely and major advance in providing in-depth and comprehensive coverage of medical genetics for the lay reader. The two volumes include nearly 400 substantive entries on genetic diseases and conditions as well as information on basic genetics concepts such as DNA, chromosomes, genetic testing, and pedigree analysis and construction (genetic family history). An advisory board of seven distinguished genetics specialists (clinical geneticists and genetic counselors) oversaw the accuracy of the text, which is authored by an international slate of clinicians, .