Question

What is incomplete dominance?

Hint:

Incomplete dominance is different from co-dominance — in co-dominance, both traits are fully expressed, while in incomplete dominance, an intermediate form appears.

Answer 1

Step 1: Definition.
Incomplete dominance is a type of inheritance where the phenotype of the heterozygote is an intermediate form between the two homozygotes. Neither allele is completely dominant over the other.
Step 2: Example.
In Mirabilis jalapa (4 o'clock plant), when red-flowered (RR) and white-flowered (rr) plants are crossed, the F\textsubscript{1} hybrid (Rr) has pink flowers, which is intermediate.
Step 3: Conclusion.
Thus, incomplete dominance shows blending of traits in heterozygotes.