Snapdragons crossed (Rr x Rr) produced 100 offspring with phenotypes: 28 red, 50 pink, 22 white. Expected ratio for incomplete dominance is 1:2:1.
The data are consistent with which inheritance pattern?
- A
Sex-linked inheritance.
- B
Codominance: each allele contributes a distinct phenotype.
- C
Complete dominance with a 3:1 ratio.
- Dcheck_circle
Incomplete dominance: Rr heterozygotes show an intermediate (pink) phenotype.
Explanation
The 1:2:1 phenotypic ratio (and the appearance of an intermediate phenotype in heterozygotes) is the signature of incomplete dominance.