Te crossing of `F_(1)` hybrid with either of the parents is known as______________.

Answer

To answer the question, "The crossing of F1 hybrid with either of the parents is known as______________," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- F1 hybrid refers to the first filial generation resulting from the cross of two different parental lines.
- The parents in this context are referred to as P1 and P2.

2. **Identify the Cross**:
- When we cross the F1 hybrid with one of the original parents (P1 or P2), we are performing a specific type of genetic cross.

3. **Define the Type of Cross**:
- The crossing of the F1 hybrid with one of the parents is known as a **back cross**. This is because we are going back to one of the original parental lines.

4. **Differentiate Between Crosses**:
- If the F1 hybrid is specifically crossed with a recessive parent, this is known as a **test cross**. This helps in determining the genotype of the F1 hybrid.

5. **Conclusion**:
- Therefore, the answer to the question is that the crossing of F1 hybrid with either of the parents is known as a **back cross**.

### Final Answer:
The crossing of F1 hybrid with either of the parents is known as **back cross**.

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