Quantitative genetics

Quantitative genetics, the field founded by the originators of the modern
synthesis, Ronald Fisher, Sewall Wright and J. B. S. Haldane, aims to
predict the response to selection given data on the phenotype and
relationships of individuals. A more recent development of quantitative
genetics is the analysis of quantitative trait loci. Traits that are under
the influence of a large number of genes are known as quantitative traits,
and their mapping to a location on the chromosome requires accurate
phenotypic, pedigree and marker data from a large number of related
individuals. Quantitative genetics build on some of the same principles as
population genetics.