A cross between two tall Garden Pea Plants produced all tall plants. The possible genotype of the parents are
(I)TT,TT(II)TT,Tt(III)Tt,tt(IV) Tt,Tt
Correct answer is

Options

A. III,IV
B. I,IV
C. I,II
D. II,III

Answer

To solve the question regarding the cross between two tall Garden Pea plants that produced all tall plants, we need to analyze the possible genotypes of the parents.

### Step-by-Step Solution:

1. **Understand the Trait**:
- The trait for height in Garden Pea plants is controlled by a single gene with two alleles:
- **T** (dominant allele for tallness)
- **t** (recessive allele for shortness)
- Tall plants can have either the homozygous genotype (TT) or the heterozygous genotype (Tt).

2. **Analyze the Offspring**:
- The problem states that a cross between two tall plants produces all tall offspring. This indicates that the offspring must have at least one dominant allele (T) to express the tall phenotype.

3. **Evaluate Each Option**:
- **Option I: TT x TT**
- Cross: TT x TT
- Offspring: All TT (tall)
- Result: All tall plants (valid)

- **Option II: TT x Tt**
- Cross: TT x Tt
- Offspring: 50% TT (tall), 50% Tt (tall)
- Result: All tall plants (valid)

- **Option III: Tt x tt**
- Cross: Tt x tt
- Offspring: 50% Tt (tall), 50% tt (short)
- Result: Not all tall plants (invalid)

- **Option IV: Tt x Tt**
- Cross: Tt x Tt
- Offspring: 25% TT (tall), 50% Tt (tall), 25% tt (short)
- Result: Not all tall plants (invalid)

4. **Conclusion**:
- The only valid options that produce all tall offspring are **Option I (TT x TT)** and **Option II (TT x Tt)**. Therefore, the correct answer is **Option I and II**.

### Final Answer:
The correct answer is **(I) TT, TT and (II) TT, Tt**.