Which of the following cross will give recessive progeny in `F_(1)` generation

Options

A. `T T x tt
B. `Tt xx T T`
C. tt X tt
D. `T T xx T T`

Answer

To determine which cross will give recessive progeny in the F1 generation, we need to analyze each option provided in the question. Here's a step-by-step solution:

### Step 1: Understand the Basics of Dominance and Recessiveness
- Dominant traits are expressed in the phenotype when at least one dominant allele is present (e.g., T for tall).
- Recessive traits are expressed only when two recessive alleles are present (e.g., tt for dwarf).

### Step 2: Analyze Each Option
1. **Option A: Tt x tt**
- Parent 1 (Tt) can produce gametes: T, t
- Parent 2 (tt) can produce gametes: t, t
- Possible F1 progeny: Tt (tall), tt (dwarf)
- Result: This cross can produce recessive progeny (tt).

2. **Option B: Tt x TT**
- Parent 1 (Tt) can produce gametes: T, t
- Parent 2 (TT) can produce gametes: T, T
- Possible F1 progeny: TT (tall), Tt (tall)
- Result: No recessive progeny (all tall).

3. **Option C: tt x tt**
- Parent 1 (tt) can produce gametes: t, t
- Parent 2 (tt) can produce gametes: t, t
- Possible F1 progeny: tt (dwarf)
- Result: All progeny are recessive (tt).

4. **Option D: TT x TT**
- Parent 1 (TT) can produce gametes: T, T
- Parent 2 (TT) can produce gametes: T, T
- Possible F1 progeny: TT (tall)
- Result: No recessive progeny (all tall).

### Step 3: Conclusion
- The only crosses that can produce recessive progeny in the F1 generation are **Option A (Tt x tt)** and **Option C (tt x tt)**.
- However, since the question asks for which cross will give recessive progeny in the F1 generation, **Option C (tt x tt)** is the most straightforward answer, as all progeny will be recessive.

### Final Answer
**Option C: tt x tt will give recessive progeny in the F1 generation.**

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