In one of my settings, the people have domesticated the wild raspberry plant, and selectively bred it for larger and larger berries. Would it be plausible for these berries to reach the sizes of apples (or larger), or would this not be possible due to things like the biology of raspberry plants/soil richness/etc? If it were possible/plausible, what could/would these large raspberries be like, and what would the raspberry plants themselves look like if they had such large fruit?
(Since raspberries are made of small round parts, I am imagining they would either be made of many more or much larger of these small round parts.)
The kind of answer I am looking for would be something along the lines of "raspberries of that size would/wouldn't be possible because of X, and if they were possible they could look/taste like Y or Z, and the plants would look like ABC"