In the comparatively short time since 1953 there have been ground-breaking discoveries that have changed the way we look at ourselves, and have been instrumental in addressing many of the problems associated with 'genetic diseases' in general.A new vocabulary has evolved in the light of these discoveries. Intron, exon, prion, hox, codon, polymerase, epistasis, gyandromorph, telomere, Morgellon's, BRCA and many others have crept into the vocabulary and are being used more and more.The study of Genetics can be very daunting for a student embarking on the adventure for the very first time. This book is intended, initially, to cover much of the syllabus for A-Level and High School studies, but because of the simple language, tables and graphics, however, the subject matter will be easily absorbed by, and be of great interest to, the comparative lay persons among us.