Why is codominance different from incomplete dominance?

Codominance and incomplete dominance differ in how alleles express in the heterozygous condition.

Key Difference

Feature	Codominance	Incomplete Dominance
Expression	Both alleles fully expressed	Both alleles partially expressed
Phenotype	Both traits visible separately	Blended or intermediate trait
Example	Blood group AB	Pink flower (red × white)

Understanding the Difference

Case	Result
Codominance	A and B both seen clearly
Incomplete Dominance	New mixed form appears

Stepwise Understanding

1. In codominance, both alleles remain active

2. Each produces its own effect

3. Traits appear side by side

4. In incomplete dominance, neither dominates fully

5. Traits combine to form a blended phenotype

Important Concept

Codominance = both visible separately
Incomplete dominance = traits mix

Real Insight

In blood group AB, both A and B antigens are present clearly, not mixed, while in flowers, colors blend into a new shade.

So difference lies in whether traits stay separate or combine into one intermediate form.