This application was created for the workshop "THE GRANDMOTHERS, THE GENETICS AND THE DDHH" This workshop is given in the city of San Luis (Argentina) as part of a project of the Secretary of University Extension of the National University of San Luis. The objective of this application is to show, in a didactic way, how genes are inherited from parents to children (and later to new children) and how this knowledge can be used for the identification and affiliation of people.