If a heterozygous tall plant is crossed with a homozygous dwarf plant then what shall be the percentage of dwarf in offspring

Options

A. `25%`
B. `100%`
C. `75%`
D. `50%`

Answer

To solve the problem of determining the percentage of dwarf plants in the offspring when a heterozygous tall plant is crossed with a homozygous dwarf plant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes of the Parents**:
- The heterozygous tall plant has the genotype **Tt** (where T = tall, t = dwarf).
- The homozygous dwarf plant has the genotype **tt** (both alleles are recessive).

2. **Determine the Possible Gametes**:
- The heterozygous tall plant (Tt) can produce two types of gametes: **T** (dominant) and **t** (recessive).
- The homozygous dwarf plant (tt) can only produce one type of gamete: **t**.

3. **Set Up the Punnett Square**:
- Create a Punnett square to visualize the possible combinations of gametes from the parents.
- The rows will represent the gametes from the heterozygous tall plant (T and t), and the columns will represent the gametes from the homozygous dwarf plant (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** (tall) - 2 occurrences
- **tt** (dwarf) - 2 occurrences

5. **Calculate the Percentage of Each Phenotype**:
- Total offspring = 4 (2 Tt + 2 tt)
- Percentage of tall plants (Tt) = (2/4) * 100 = 50%
- Percentage of dwarf plants (tt) = (2/4) * 100 = 50%

### Final Answer:
The percentage of dwarf plants in the offspring is **50%**.

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