G matrix https://cran.r-project.org/web/packages/snpReady/snpReady.pdf relationship matrix Philippe Rocca-Serra A matrix of relationships among a group of individuals, which can be used to predict breeding values, to manage inbreeding and in genetic conservation. It can be calculated from the pedigree, but it is also possible to calculate the relationship matrix from genotypes at genetic markers such as single-nucleotide polymorphisms (SNPs). Elements of the genomic relationship matrix are estimates of the realized proportion of the genome that two individuals share, whereas the pedigree-derived relationship matrix is the expectation of this proportion. https://doi.org/10.3168/jds.2007-0980 https://www.ncbi.nlm.nih.gov/pubmed/22059574 realized genomic relationship matrix matrix ready for release