Answer:
A phenotypic outcome that would indicate codominance woul be if the flowers produced had both red and white petals or had red and white colour expressed at the same time.
Explanation:
Codominance is when two phenotypes both show up in the resultant offspring. The most common rexample for codominance is roan cattle or animals with spotty patterns that can have browns, blacks and white simlutaneously. So if the red and white phenotypes both appeared (and the petals of the flower had red and white but were not a mix of red and white-ie pink flowers would be incomplete dominance-) then this would indicate codominance was an inhereitance pattern of the flower species.