Biology for IGCSE & O level - Inheritance (Section 6 - No. 4)

What is the expected phenotypic ratio in a monohybrid cross if the alleles show incomplete dominance?

3:1

1:2:1

9:3:3:1

1:1

Incomplete dominance leads to a 1:2:1 phenotypic ratio, reflecting the different phenotypic expressions of the genotypes.