Question:
In the \(F_{2}\) generation, the genotypic and phenotypic ratios are identical in ____.
In the \(F_{2}\) generation, the genotypic and phenotypic ratios are identical in ____.
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Look for the case where the heterozygote shows both alleles, so each genotype has its own phenotype.
Updated On: Nov 12, 2026
- Mendelian monohybrid cross
- Pleiotropy
- Co-dominance
- Multiple alleles
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
The genotypic and phenotypic ratios are equal only when every genotype shows a different phenotype.
Step 2: Mendelian monohybrid cross
The \(F_{2}\) genotypic ratio is 1 : 2 : 1 but the phenotypic ratio is 3 : 1, because dominance hides the heterozygote.
Step 3: Co-dominance
In co-dominance the heterozygote shows both alleles (for example AB blood group). The \(F_{2}\) ratio is 1 : 2 : 1 for both genotype and phenotype.
Step 4: Conclusion
Pleiotropy is about one gene affecting many traits and does not give a fixed match. Co-dominance is the answer.
Final Answer:
Co-dominance has identical genotypic and phenotypic ratios in \(F_{2}\). \[ \boxed{\text{(C) }\text{Co-dominance}} \]
The genotypic and phenotypic ratios are equal only when every genotype shows a different phenotype.
Step 2: Mendelian monohybrid cross
The \(F_{2}\) genotypic ratio is 1 : 2 : 1 but the phenotypic ratio is 3 : 1, because dominance hides the heterozygote.
Step 3: Co-dominance
In co-dominance the heterozygote shows both alleles (for example AB blood group). The \(F_{2}\) ratio is 1 : 2 : 1 for both genotype and phenotype.
Step 4: Conclusion
Pleiotropy is about one gene affecting many traits and does not give a fixed match. Co-dominance is the answer.
Final Answer:
Co-dominance has identical genotypic and phenotypic ratios in \(F_{2}\). \[ \boxed{\text{(C) }\text{Co-dominance}} \]
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