The term 'subject of a modern map' can be summarized by the solution to the crossword, 'genome'. A genome is the complete set of genetic material present in an organism. It contains all the information necessary for the organism's development and functioning. Genomes are made up of DNA and are unique to each species. In recent years, advances in technology have allowed scientists to map out the genomes of many different organisms, providing valuable insight into their biology and evolution.