Question:
Phenotype and genotype ratios in \(F_{2}\) progeny are the same in:
Phenotype and genotype ratios in \(F_{2}\) progeny are the same in:
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Incomplete dominance is the only standard monohybrid inheritance pattern in which phenotypic ratio and genotypic ratio in \(F_2\) generation are both \(1:2:1\).
Updated On: Jun 17, 2026
- Complete dominance
- Incomplete dominance
- Epistasis
- Hypostasis
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The Correct Option is B
Solution and Explanation
Concept:
In incomplete dominance, neither allele is completely dominant over the other. Therefore, the heterozygous individual shows an intermediate phenotype.
Step 1: Consider a monohybrid cross under incomplete dominance.
Example: \[ RR \times rr \] \[ F_1 : Rr \] \[ F_2 : RR : Rr : rr = 1:2:1 \]
Step 2: Phenotypic ratio obtained.
Since heterozygote has a distinct phenotype, \[ \text{Phenotypic ratio}=1:2:1 \] \[ \text{Genotypic ratio}=1:2:1 \] Thus both ratios are identical.
Step 1: Consider a monohybrid cross under incomplete dominance.
Example: \[ RR \times rr \] \[ F_1 : Rr \] \[ F_2 : RR : Rr : rr = 1:2:1 \]
Step 2: Phenotypic ratio obtained.
Since heterozygote has a distinct phenotype, \[ \text{Phenotypic ratio}=1:2:1 \] \[ \text{Genotypic ratio}=1:2:1 \] Thus both ratios are identical.
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