Heterozygous tall plants were crossed with dwarf plants. What will be the ratio of dwarf plants in the progeny :-

Options

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

Answer

To solve the question regarding the ratio of dwarf plants in the progeny when heterozygous tall plants are crossed with dwarf plants, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes**:
- Heterozygous tall plants have the genotype **Tt** (where T = tall allele, t = dwarf allele).
- Dwarf plants have the genotype **tt**.

2. **Set Up the Cross**:
- We will cross the heterozygous tall plants (Tt) with the dwarf plants (tt).
- The cross can be represented as: **Tt x tt**.

3. **Determine the Gametes**:
- The gametes produced by the heterozygous tall plant (Tt) are **T** and **t**.
- The gametes produced by the dwarf plant (tt) are both **t**.

4. **Create a Punnett Square**:
- Set up a Punnett square to visualize the offspring:
```
T t
------------
t | Tt | tt |
------------
t | Tt | tt |
```
- From the Punnett square, we can see the possible genotypes of the offspring:
- **Tt** (heterozygous tall)
- **tt** (dwarf)

5. **Count the Offspring Ratios**:
- From the Punnett square, we see:
- 2 squares show **Tt** (tall)
- 2 squares show **tt** (dwarf)
- Therefore, the ratio of dwarf plants (tt) to the total number of plants is:
- Dwarf plants (tt): 2
- Total plants: 4
- Ratio of dwarf plants = 2/4 = 1/2 or 50%.

6. **Conclusion**:
- The ratio of dwarf plants in the progeny is **50%**.

### Final Answer:
The ratio of dwarf plants in the progeny is **50%**.

---