Question:
In Mendel's monohybrid cross, the phenotypic ratio of long and dwarf pea is
In Mendel's monohybrid cross, the phenotypic ratio of long and dwarf pea is
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The phenotypic ratio of long to dwarf in a monohybrid cross is always 3 : 1.
Updated On: Sep 3, 2025
- 3 : 1
- 1 : 3
- 1 : 2 : 1
- 1 : 1 : 2
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The Correct Option is A
Solution and Explanation
Step 1: Recall Mendel's monohybrid cross.
In a monohybrid cross between two heterozygous pea plants (Tt × Tt), where T represents the dominant allele for long and t represents the recessive allele for dwarf, Mendel observed the inheritance of these traits.
Step 2: Determine the genotypic and phenotypic ratios.
The genotypic ratio for this cross is 1 TT : 2 Tt : 1 tt. Since both TT and Tt plants express the long phenotype (dominant), and tt expresses the dwarf phenotype (recessive), the phenotypic ratio is 3 long : 1 dwarf.
Step 3: Conclusion.
Thus, the phenotypic ratio is 3 : 1.
Final Answer: \[ \boxed{3 : 1} \]
In a monohybrid cross between two heterozygous pea plants (Tt × Tt), where T represents the dominant allele for long and t represents the recessive allele for dwarf, Mendel observed the inheritance of these traits.
Step 2: Determine the genotypic and phenotypic ratios.
The genotypic ratio for this cross is 1 TT : 2 Tt : 1 tt. Since both TT and Tt plants express the long phenotype (dominant), and tt expresses the dwarf phenotype (recessive), the phenotypic ratio is 3 long : 1 dwarf.
Step 3: Conclusion.
Thus, the phenotypic ratio is 3 : 1.
Final Answer: \[ \boxed{3 : 1} \]
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