In North America,there Are More Than 60 Species of Mice

Essay

In North America,there are more than 60 species of mice in the genus Peromyscus,most of whom closely resemble one another.You wish to determine the relatedness of three of these species: the deer mouse,the oldfield mouse,and the white-footed mouse.You set up breeding experiments and find that deer mice and oldfield mice will reluctantly breed with one another,but neither one will breed with white-footed mice.What do you determine to be the pattern of relatedness of these three species?