A species of aster normally blooms between mid-August and late September. The range of the aster is located in a climate that usually produces freezing temperatures in late October. The pollinators (bees, ants, and other insects) of the aster are active between late April and early October.

Mutations can occur in the gene that controls flowering time for some individuals of this aster, causing them to flower earlier or longer than normal. The table shows possible flowering times.

Describe how this population of asters might split into two species.

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Aster Type Normal Early mutation Expanded mutation Flowering Time August 15-September 30 July 1-August 15 July 15-September 30