Question

In cattle, red coat color is co-dominant to white coat color. What could be the result of a cross between a RR male and a WW female?

Answer 1

the definition you provided is for co-dominance. In incomplete dominance the trait of the dominant allele is diminished because of a mutation and therefore if paired with a recessive trait the dominant trait will be muted. This still results in a pink color because muted red is pink, but the mechanism is different.