( a ) if color is the phenotype, then is inncomplete dominance if amount of oil is considered as phenotype it is true dominance
( b ) if color is the phenotype, then is incomplete dominance if amount of oil is considered as phenotype it is co-dominance
( c ) if color is the phenotype, then is true dominance if amount of oil is considered as phenotype it is incomplete dominance
( d ) if color is the phenotype, then is codominance if amount of oil is considered as phenotype it is incomplete dominance