Plasmids are small DNA fragments that occur in many bacterial cells.
Incomplete dominance is when one allele is not completely dominant over the other (blend in), and codominance is when both alleles affect the phenotype(appearance)
Example of incomplete dominance: a red flower mates with a with flower and makes an pink offspring
Example of codominance: a brown cow mates with a with cow and the offspring being with and brown polkadots
I think calcium but i could be wrong