In this simulation, blood groups and Rh can be studied, as well as the way in which these are inherited by children. The objective of the practice is to determine the father of the child by means of the tests of blood groups and Rh, for which agglutination tests are made, Punnett squares are constructed and the phenotypic percentages are determined. The simulator recreates a laboratory with droppers, slides, blood samples and serum to perform the necessary tests.