If a homozygous tall pistillate plant is crossed with a dwarf staminate plant, the genotype of endosperm will be

Options

A. Tt
B. ttT
C. ttt
D. TTT

Explanation

To solve the problem of determining the genotype of the endosperm when a homozygous tall pistillate plant is crossed with a dwarf staminate plant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes of the Parent Plants**:
- The homozygous tall pistillate plant has the genotype **TT** (homozygous dominant).
- The dwarf staminate plant has the genotype **tt** (homozygous recessive).

2. **Understand the Cross**:
- We are crossing a homozygous tall plant (TT) with a dwarf plant (tt). This means we will be combining the alleles from both parents.

3. **Perform the Cross**:
- When we cross TT (from the tall plant) with tt (from the dwarf plant), we can set up a Punnett square or simply combine the alleles:
- The tall plant contributes **T** alleles.
- The dwarf plant contributes **t** alleles.
- The resulting combinations will be:
- From the first T (from TT) and the first t (from tt): **Tt**
- From the first T (from TT) and the second t (from tt): **Tt**
- From the second T (from TT) and the first t (from tt): **Tt**
- From the second T (from TT) and the second t (from tt): **Tt**
- Thus, all offspring from this cross will have the genotype **Tt**.

4. **Determine the Genotype of the Endosperm**:
- In this case, the endosperm is formed from the fusion of the gametes from the pistillate and staminate plants. Since all the resulting genotypes from the cross are **Tt**, the genotype of the endosperm will also be **Tt**.

5. **Conclusion**:
- Therefore, the genotype of the endosperm will be **Tt**.

### Final Answer:
The genotype of the endosperm will be **Tt**.