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

Options

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

Answer

To determine the result of self-pollinating a tall F2 plant, we need to consider the possible genotypes of the tall plants in the F2 generation. Here’s a step-by-step solution:

### Step 1: Identify the Genotypes of Tall F2 Plants
In Mendel's experiments, the F2 generation can have two possible genotypes for tall plants:
- Homozygous tall (TT) - represented as capital T capital T
- Heterozygous tall (Tt) - represented as capital T small t

### Step 2: Self-Pollinate the Homozygous Tall Plant (TT)
If Mendel self-pollinated a homozygous tall plant (TT):
- The cross would be TT x TT.
- The offspring would all inherit the TT genotype.
- Therefore, all progeny would be tall.

### Step 3: Self-Pollinate the Heterozygous Tall Plant (Tt)
If Mendel self-pollinated a heterozygous tall plant (Tt):
- The cross would be Tt x Tt.
- The possible offspring genotypes would be:
- TT (homozygous tall)
- Tt (heterozygous tall)
- tt (homozygous dwarf)
- The phenotypic ratio would be 3 tall (TT and Tt) to 1 dwarf (tt).

### Step 4: Conclusion
Since the question specifies self-pollinating a tall F2 plant, we can conclude that:
- If the plant is homozygous (TT), all offspring will be tall (TT).
- If the plant is heterozygous (Tt), the offspring will include both tall and dwarf plants.

However, since the question asks for the result of self-pollinating a tall F2 plant without specifying the genotype, we can summarize that:
- If the tall plant is homozygous (TT), all offspring will be TT (tall).
- If the tall plant is heterozygous (Tt), the offspring will be 3 tall (TT and Tt) and 1 dwarf (tt).

Thus, the answer to the question is that if Mendel self-pollinated a tall F2 plant, he would get either all tall plants (if TT) or a mix of tall and dwarf plants (if Tt).

### Final Answer
The result would depend on the genotype of the tall F2 plant:
- If TT: All offspring will be TT (tall).
- If Tt: Offspring will be 3 tall (TT and Tt) to 1 dwarf (tt).