Question:
If a tall plant with TT genotype is crossed with Dwarf plant with tt genotype. What will be the genotypic ratio of TT : Tt : tt in F$_2$ generation respectively, when the F$_1$ progeny is allowed for selfing?
If a tall plant with TT genotype is crossed with Dwarf plant with tt genotype. What will be the genotypic ratio of TT : Tt : tt in F$_2$ generation respectively, when the F$_1$ progeny is allowed for selfing?
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Selfing a heterozygote (Tt $\times$ Tt) always gives 1 TT : 2 Tt : 1 tt (genotypic ratio) and 3 tall : 1 dwarf (phenotypic ratio).
Updated On: May 26, 2026
- 2 : 1 : 1
- 1 : 2 : 1
- 1 : 1 : 2
- 3 : 1 : 1
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Concept
Mendelian Genetics: Monohybrid cross and selfing.
Step 2: Meaning
When a heterozygous F$_1$ plant (Tt) is selfed, the Punnett square gives the F$_2$ genotypic ratio.
Step 3: Analysis
P: TT $\times$ tt $\rightarrow$ F$_1$: all Tt.
F$_1$ self (Tt $\times$ Tt): \[ \begin{array}{c|cc} & T & t \hline T & TT & Tt t & Tt & tt \end{array} \] F$_2$ genotypic ratio: TT : Tt : tt = 1 : 2 : 1.
Step 4: Conclusion
Selfing the heterozygous F$_1$ gives a 1 : 2 : 1 genotypic ratio in F$_2$. Final Answer: (B)
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