What result Mendel would have got, had he self pollinated a Tt tall `F_(2)` plant

Options

A. TT and Tt
B. All Tt
C. All TT
D. All tt.

Answer

To determine the results Mendel would have obtained by self-pollinating a Tt tall F2 plant, we can follow these steps:

### Step 1: Identify the Genotype
The Tt tall F2 plant is heterozygous for the tall trait, meaning it has one dominant allele (T) for tallness and one recessive allele (t) for dwarfness.

### Step 2: Set Up a Punnett Square
We will set up a Punnett square to visualize the results of the self-pollination. The alleles from the Tt parent will be placed on the top and side of the square:
- Top: T and t
- Side: T and t

### Step 3: Fill in the Punnett Square
Now we fill in the Punnett square:

| | T | t |
|---|---|---|
| T | TT | Tt |
| t | Tt | tt |

### Step 4: Analyze the Results
From the Punnett square, we can see the following genotypes:
- 1 TT (homozygous tall)
- 2 Tt (heterozygous tall)
- 1 tt (homozygous dwarf)

### Step 5: Determine the Phenotypic Ratio
Now we can determine the phenotypic ratio:
- Tall plants (TT and Tt): 3 (1 TT + 2 Tt)
- Dwarf plants (tt): 1

Thus, the phenotypic ratio is 3 tall : 1 dwarf.

### Conclusion
If Mendel had self-pollinated a Tt tall F2 plant, he would have obtained a phenotypic ratio of 3 tall plants to 1 dwarf plant.

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