is about genotype information genotype matrix Philippe Rocca-Serra a genotype matrix is a kind of genomic relationship matrix in the rawest of form and which simply corresponds to a matrix of individuals genotype for a given set of markers or genomic positions. Columns are snps or markers, Rows are individuals. Each column/row cell contains a genotype expressed as, in the genome is diploid, as a pair of characters chosen from ATGC where the dominant variant is uppercased and the recessive variant is lower cased. http://articles.extension.org/pages/68019/genomic-relationships-and-gblup matrix ready for release