What is a red raspberry and a blackberry mixed?

A red raspberry and a blackberry mixed would produce a hybrid fruit known as a "raspberry blackberry" or "black raspberry." These fruits belong to the same genus, Rubus, and share similar growing conditions. The hybrid typically exhibits characteristics from both parent fruits, such as the tartness of raspberries and the sweetness of blackberries, resulting in a unique flavor profile. They are often enjoyed fresh, in desserts, or as part of jams and jellies.