Heterozygous tall (Tt) is crossed with homozygous tall (TT). Percentage of heterozygous tall in the progeny would be

Options

A. 0.25
B. 0.5
C. 0.75
D. 1

Answer

To solve the problem of determining the percentage of heterozygous tall (Tt) in the progeny from a cross between a heterozygous tall (Tt) plant and a homozygous tall (TT) plant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes of the Parents**:
- One parent is heterozygous tall (Tt).
- The other parent is homozygous tall (TT).

2. **Determine the Gametes Produced by Each Parent**:
- The heterozygous parent (Tt) can produce two types of gametes: T and t.
- The homozygous parent (TT) can only produce one type of gamete: T.

3. **Set Up a Punnett Square**:
- Create a Punnett square to visualize the possible combinations of the gametes from both parents.
- The rows will represent the gametes from the heterozygous parent (T and t), and the columns will represent the gametes from the homozygous parent (T).

| | T | T |
|-------|-----|-----|
| **T** | TT | TT |
| **t** | Tt | Tt |

4. **Analyze the Offspring Genotypes**:
- From the Punnett square, we can see the possible genotypes of the offspring:
- TT (homozygous tall) - 2 occurrences
- Tt (heterozygous tall) - 2 occurrences

5. **Calculate the Proportions**:
- Total offspring = 4 (2 TT + 2 Tt)
- Proportion of heterozygous tall (Tt) = Number of Tt / Total Offspring = 2 / 4 = 0.5

6. **Convert to Percentage**:
- To find the percentage of heterozygous tall in the progeny, multiply the proportion by 100:
- Percentage of heterozygous tall = 0.5 × 100 = 50%

### Final Answer:
The percentage of heterozygous tall (Tt) in the progeny would be **50%**.

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