The degree by which progeny differ from their parents is known as

Options

A. Genetics
B. Variation
C. Heredity
D. Inheritance

Answer

To solve the question "The degree by which progeny differ from their parents is known as," we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes the extent of difference between progeny (offspring) and their parents.

2. **Analyzing the Options**:
- **Option A: Genetics**: This term refers to the branch of biology that studies heredity and the variation of inherited characteristics. While it encompasses the study of differences, it does not specifically refer to the degree of difference itself. Thus, this option is not correct.

- **Option B: Variation**: This term specifically refers to the differences in traits that can occur between individuals, including differences between progeny and their parents. It is the correct term to describe the degree of difference.

- **Option C: Hereditary**: This term relates to the transmission of traits from parents to offspring. It describes the process rather than the degree of difference, making it an incorrect choice.

- **Option D: Inheritance**: Similar to hereditary, inheritance refers to the process of passing traits from parents to offspring. It does not address the degree of difference, so this option is also incorrect.

3. **Conclusion**: After analyzing all the options, the correct answer is **Option B: Variation**. This term accurately describes the degree by which progeny differ from their parents.

### Final Answer:
The degree by which progeny differ from their parents is known as **Variation**.

---