Genetics Problem: Calculating F2 Genotypic Ratio
This problem involves a monohybrid cross and determining the genotypic ratio in the F2 generation using Mendelian genetics principles.
Parental Cross
The cross is between a homozygous tall plant (TT) and a homozygous dwarf plant (tt).
Parental Genotypes: TT x tt
F1 Generation
All gametes from the TT parent carry the T allele. All gametes from the tt parent carry the t allele.
The resulting F1 generation will have the genotype Tt. These plants will be phenotypically tall because T (tall) is dominant over t (dwarf).
F1 Genotype: Tt
F1 Selfing and F2 Generation
The F1 generation (Tt) is allowed to self-pollinate (Tt x Tt).
Gametes produced by each F1 parent are T and t.
We can use a Punnett square to determine the F2 genotypes:
| T | t | |
| T | TT | Tt |
| t | Tt | tt |
F2 Genotypic Ratio
From the Punnett square, the genotypes in the F2 generation are:
- TT: 1 occurrence
- Tt: 2 occurrences
- tt: 1 occurrence
The genotypic ratio of TT : Tt : tt in the F2 generation is 1 : 2 : 1.
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