Which of the following parental combination has produced mutant offspring ?

Options

A. `Tt xx `tt` = Tt`
B. `tt` x `tt` = Tt`
C. `Tt xx Tt =`tt`
D. `"TT" xx` tt` = Tt`

Answer

To determine which parental combination has produced mutant offspring, we can analyze the given combinations step by step.

### Step-by-Step Solution:

1. **Identify the Parental Combinations**:
- The combinations provided are:
- Option 1: Unknown combination
- Option 2: Capital T (T) and small t (t)
- Option 3: Small t (t) and small t (t)
- Option 4: Capital T (T) and Capital T (T)

2. **Analyze Option 2 (Tt x t)**:
- Parental Genotypes: Tt (heterozygous) and tt (homozygous recessive).
- Gametes produced:
- From Tt: T and t
- From tt: t
- Possible Offspring:
- Tt (dominant trait)
- tt (recessive trait)
- Result: This combination produces both dominant and recessive traits, but not mutants.

3. **Analyze Option 3 (tt x tt)**:
- Parental Genotypes: tt (homozygous recessive) and tt (homozygous recessive).
- Gametes produced:
- From both parents: t
- Possible Offspring:
- tt (only recessive trait)
- Result: This combination produces only recessive traits, no mutants.

4. **Analyze Option 4 (TT x tt)**:
- Parental Genotypes: TT (homozygous dominant) and tt (homozygous recessive).
- Gametes produced:
- From TT: T
- From tt: t
- Possible Offspring:
- Tt (dominant trait)
- Result: This combination produces only dominant traits, no mutants.

5. **Analyze Option 1 (Unknown)**:
- Since the first option is not specified, we cannot analyze it without further information.

6. **Conclusion**:
- Based on the analysis of the given combinations, none of the specified combinations (2, 3, and 4) produced mutant offspring. However, if we assume the first option had a combination that included a mutant trait, it could potentially be the answer.

### Final Answer:
- Without additional information about Option 1, we cannot definitively conclude which combination produced mutant offspring. However, based on the analysis, Options 2, 3, and 4 do not produce mutants.