Both phenotypic and genotypic ratio of `F_(2)` are same in

Options

A. Co-dominance
B. Incomplete dominance
C. Out cross
D. More than one option is correct

Answer

To determine in which inheritance patterns both the phenotypic and genotypic ratios of the F2 generation are the same, we can analyze the options provided in the question.

### Step-by-Step Solution:

1. **Understand the Concepts**:
- **Phenotypic Ratio**: The ratio of different phenotypes (observable traits) in the offspring.
- **Genotypic Ratio**: The ratio of different genotypes (genetic makeup) in the offspring.

2. **Identify the Inheritance Patterns**:
- The question mentions two inheritance patterns: **Codominance** and **Incomplete Dominance**.

3. **Analyze Codominance**:
- In codominance, both alleles in a heterozygote are fully expressed. A classic example is the ABO blood group system.
- For example, crossing IA (A allele) with IB (B allele) results in the AB phenotype.
- The genotypic ratio for a cross between IAIA and IBIB is 1 IAIA : 2 IAIB : 1 IBIB, which corresponds to the phenotypic ratio of 1 A : 2 AB : 1 B.
- Therefore, in codominance, the phenotypic and genotypic ratios are not the same.

4. **Analyze Incomplete Dominance**:
- In incomplete dominance, the heterozygote expresses a phenotype that is intermediate between the two homozygous phenotypes.
- For example, crossing red flowers (RR) with white flowers (WW) produces pink flowers (RW).
- When pink flowers (RW) self-fertilize, the offspring will be in the ratio of 1 RR : 2 RW : 1 WW.
- This results in a phenotypic ratio of 1 red : 2 pink : 1 white, which is the same as the genotypic ratio.
- Thus, in incomplete dominance, the phenotypic and genotypic ratios are the same.

5. **Conclusion**:
- Both codominance and incomplete dominance were analyzed, but only incomplete dominance has the same phenotypic and genotypic ratios in the F2 generation.
- Therefore, the correct answer to the question is **Incomplete Dominance**.

### Final Answer:
The inheritance pattern where both phenotypic and genotypic ratios of F2 are the same is **Incomplete Dominance**.