A cross between two snap dragon plants, one with red flowers and one with bright white flowers produces F1 offspring that are pink. When the F1 progeny are selfed a 1 : 2 : 1 ratio of red to pink to white flowers is observed. What genetic phenomenon is consistent with these results?

Incomplete dominance is a type of inheritance in which one allele for a specific trait is not completely dominant over the other allele. This results in a combined phenotype (expressed physical trait). For example, if you cross pollinate red and white snapdragon plants, the dominant allele that produces the red color is not completely dominant over the recessive allele that produces the white color. The resulting offspring are pink.