Figure 3From: Early evolution of evolutionary thinking: teaching biological evolution in elementary schoolsMain steps of the activity about heredity and genealogical trees. (A) Ask students to draw their own genealogical tree using the traits discussed in the activity about intra-specific diversity and the model-tree and ask them why two brothers are in general more similar to each other than to their cousins. (B) Representation of the model-tree used by the students.Back to article page