For a molecule with one chiral center, there are 2^n possible stereoisomers, where n is the number of chiral centers. In this case, n = 1, so there are 2^1 = 2 possible stereoisomers. The presence of a double bond and a methyl group bonded to the chiral center does not change the number of stereoisomers, as long as the chiral center remains the same. Therefore, there are 2 possible stereoisomers for this molecule.