In the deceptively innocent introduction to this book the author states that he has "written this book with the sole object of trying to arouse in clinicians some curiosity about genetics." He goes on to say that "some knowledge of genetic disciplines is surprisingly useful in assessing more accurately the role of environmental factors in disease." He admits that the book is in no sense comprehensive and rather "is something of a miscellany..." of which "... everything has been published elsewhere...", and he acknowledges the help of many others, since he claims to be a professional clinician (Reader in Medicine, University of Liverpool) and only a Sunday geneticist, who has done some work on genetic polymorphism in butterflies as a student of E. B. Ford of Oxford. And he closes this confiteor by describing himself as a "0 level mathematician."
It is sometimes helpful not to read introductions too carefully, and