In common Turtles the females predominant at

Options

A. Below `28^(@)C`
B. Above `33^(@)C`
C. Between `28^(@)-33^(@)C`
D. Sex is genetically determined.

Answer

To solve the question regarding the sex determination in common turtles, we need to analyze the temperature ranges provided in the options and their corresponding effects on the sex of the turtles.

### Step-by-Step Solution:

1. **Understanding Temperature-Dependent Sex Determination**:
- In common turtles, the sex of the hatchlings is influenced by the temperature at which the eggs are incubated. This phenomenon is known as temperature-dependent sex determination (TSD).

2. **Analyzing the Options**:
- **Option 1: Below 28 degrees Celsius**:
- At temperatures below 28 degrees Celsius, male turtles are predominantly produced. Therefore, this option is incorrect for the question asking when females are predominant.

- **Option 2: Above 33 degrees Celsius**:
- At temperatures above 33 degrees Celsius, male turtles are also predominantly produced. Thus, this option is incorrect for female predominance.

- **Option 3: Between 28 and 33 degrees Celsius**:
- This temperature range typically results in a mix of both male and female turtles. Since the question asks for when females are predominant, this option is also incorrect.

- **Option 4: Sex is genetically determined**:
- This statement is incorrect in the context of common turtles, as their sex is determined by the incubation temperature rather than genetics.

3. **Conclusion**:
- Based on the analysis, the correct answer to the question "In common turtles, females are predominant at" is **none of the provided options** accurately reflect the conditions for female predominance. However, if we consider the context of the question, it is commonly understood that females are predominantly produced in the temperature range between 28 and 33 degrees Celsius, leaning more towards the lower end of that range.

### Final Answer:
- Females are predominantly produced in common turtles at temperatures between 28 and 33 degrees Celsius.