Question:
If two heterozygous tall garden pea plants are crossed, the expected genotypic ratio in their offspring is
If two heterozygous tall garden pea plants are crossed, the expected genotypic ratio in their offspring is
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Crossing two heterozygous individuals (Tt × Tt) always gives a genotypic ratio of 1:2:1 and a phenotypic ratio of 3:1.
Updated On: Jun 3, 2025
- 3 : 1
- 1 : 1
- 1 : 2 : 1
- 1 : 0
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The Correct Option is C
Solution and Explanation
Step 1: Understand heterozygous cross.
Heterozygous tall plants have the genotype \texttt{Tt}. Crossing two such plants: \texttt{Tt × Tt} Step 2: Perform Punnett square analysis. \[ \begin{array}{c|c|c} & T & t
\hline T & TT & Tt
t & Tt & tt
\end{array} \] Step 3: Determine genotypic ratio.
- TT (homozygous tall) = 1
- Tt (heterozygous tall) = 2
- tt (dwarf) = 1 So, genotypic ratio = 1 : 2 : 1
Heterozygous tall plants have the genotype \texttt{Tt}. Crossing two such plants: \texttt{Tt × Tt} Step 2: Perform Punnett square analysis. \[ \begin{array}{c|c|c} & T & t
\hline T & TT & Tt
t & Tt & tt
\end{array} \] Step 3: Determine genotypic ratio.
- TT (homozygous tall) = 1
- Tt (heterozygous tall) = 2
- tt (dwarf) = 1 So, genotypic ratio = 1 : 2 : 1
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