Principles of Plant Breeding is organized into three main parts that address introductory topics (evolution, domestication, mating systems), biological foundations of plant breeding (genetic consequences of hybridization, heredity and environment,
biometrical genetics), and modern breeding plans.
Biometrical genetic analysis initiated by Fisher (1918), applied by Mather (1949) and popularized by Jinks and Fulker (1970), Jinks and Eaves (1974), Eaves, Last, Young and Martin (1978), is the most appropriate technique to study traits having continuous variations, e.g., intelligence.