Problem
Pollinating bumblebees of a given plant are attracted by the pink color of its flowers. In addition to being pollinated, these flowers serve as a breeding ground for these bumblebees. Over time, this plant produces a mutant version with red flowers that spreads among the pink-flowered population. A particular variant of bumblebees prefers these red flowers to pink flowers. Over time, the two bumblebee variants diverge from each other to such an extent that interbreeding becomes impossible.
i. In a geographical context, what kind of speciation occurred in this example? Justify your answer in one sentence.
ii. Which speciation mechanism is the cause of the event described in this example? Justify your answer in one sentence.