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 allele and t represents the dwarf allele).
- The genotype of the homozygous dwarf plant is tt.

### Step 2: Set Up the Punnett Square
- To visualize the genetic cross, we can set up a Punnett square. The alleles from the heterozygous tall plant (Tt) will be placed on one side, and the alleles from the homozygous dwarf plant (tt) will be placed on the other side.

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

### Step 3: Determine the Offspring Genotypes
- From the Punnett square, we can see the possible genotypes of the offspring:
- Tt (tall)
- Tt (tall)
- tt (dwarf)
- tt (dwarf)

### Step 4: Count the Offspring
- Count the number of each genotype:
- Tall (Tt): 2
- Dwarf (tt): 2

### Step 5: Calculate the Percentage of Dwarf Plants
- To find the percentage of dwarf plants, we take the number of dwarf plants and divide it by the total number of plants, then multiply by 100.

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

\[ = \left( \frac{2}{4} \right) \times 100 = 50\% \]

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