This book provides statistical and biometrical procedures to analyze genetic diversity and genotype by environment interaction. It is organized into seven chapters: Introduction, Literature review,Geographical patterns of morphological variation, Biochemical diversity analysis, Genetic diversity analysis, Genotype by environment interaction and Summary and conclusion. Literature review deals with phenotypic diversity analysis, Morphological characters as markers, Biochemical composition, DNA molecular markers, Genotype by environment interaction and stability analysis. Geographical pattern of morphological variation will help to study organization of genetic resources based on morphological diversity. Biochemical diversity analysis will asses variation in biochemical variability of genetic resources for selection and hybridization. Genetic diversity analysis will assist for organization of genetic resources and identification of parents for crossing. Genotype by environment interaction compares univariate, bivariate and multivariate stability statistics. This book will be a practical guide for graduate students and researchers.