Dominance vs Codominance Key Genetic Differences Explained
Dominance is when one allele fully masks another, giving a single visible trait. Codominance is when both alleles show up together, like two colors painting side by side on the same canvas.
Students mix these up because textbooks use similar diagrams. It feels like splitting hairs until you see a flower with spotted petals—both red and white showing. Suddenly the difference is personal, memorable, and far less abstract.
Key Differences
Dominance hides the recessive trait; codominance displays both traits at once. One keeps secrets, the other celebrates both contributors equally.
Examples and Daily Life
A black cat’s coat is dominance; a roan horse’s red-and-white hairs are codominance. Once you spot the pattern, you’ll see it in pets, plants, and even freckled friends.
Can a trait be both?
Not usually—dominance and codominance are distinct patterns for different genes.
Is blood type codominant?
Yes; AB blood shows both A and B markers together.