Sweet potatoes and regular potatoes are an example of a certain type of evolutionary relationship. Both have a similar function but are anatomically different—sweet potatoes are root modifications, whereas potatoes are stem modifications.

These types of structures, which serve similar functions but are not anatomically similar, are known as analogous structures. Analogous structures arise through a process known as convergent evolution, where different species evolve similar traits independently, often because they adapt to similar environments or ecological niches.

In contrast, homologous structures are anatomically similar due to shared ancestry but may serve different functions. This variation arises from divergent evolution, where related species evolve different traits.