You obtain two new pure-breeding mouse strains; these are strains C3PO and R2D2.
Crosses between C3PO and wild type strains produce100%wild-type mice in the F1.
Similarly, crosses between R2D2 and wild type strains and crosses between C3PO and R2D2 both produce 100% wild-type mice in the F1.
What kind or kinds of interactions can be deduced from these results?