Heterozygous tall plant (Tt) is crossed with homozygous dwarf (tt) plant. Then what will be the percentage of dwarf plants in the next generation?

Options

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

Answer

To solve the problem of determining the percentage of dwarf plants in the next generation when a heterozygous tall plant (Tt) is crossed with a homozygous dwarf plant (tt), we can follow these steps:

### Step 1: Identify the Genotypes
- The genotype of the heterozygous tall plant is Tt (where T represents the tall trait and t represents the dwarf trait).
- The genotype of the homozygous dwarf plant is tt.

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

### Step 3: Set Up a Punnett Square
- We will set up a Punnett square to visualize the possible offspring from this cross.

```
| t | t |
-------------------------
T | Tt | Tt |
-------------------------
t | tt | tt |
```

### Step 4: Analyze the Offspring Genotypes
- From the Punnett square, we can see the possible genotypes of the offspring:
- 2 Tt (tall)
- 2 tt (dwarf)

### Step 5: Calculate the Percentage of Dwarf Plants
- Out of a total of 4 offspring (2 Tt and 2 tt), the number of dwarf plants (tt) is 2.
- To find the percentage of dwarf plants, we use the formula:

\[ \text{Percentage of dwarf plants} = \left( \frac{\text{Number of dwarf plants}}{\text{Total number of plants}} \right) \times 100 \]

\[ \text{Percentage of dwarf plants} = \left( \frac{2}{4} \right) \times 100 = 50\% \]

### Conclusion
The percentage of dwarf plants in the next generation is **50%**.

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