Four inbreed/pure lines of Maize are crossed the cross is

Options

A. Double cross
B. Dihybrid cross
C. Tetrahybraid cross
D. Tetraploid cross.

Answer

To solve the question regarding the crossing of four inbred or pure lines of maize, we need to identify the correct term that describes this type of cross. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- First, we need to understand what is meant by "inbred" or "pure lines". These are genetically uniform lines that have been bred to eliminate heterozygosity.

2. **Identifying the Cross Type**:
- The question states that four inbred lines are crossed. We need to determine which type of cross this represents among the given options.

3. **Evaluating the Options**:
- **Double Cross**: This involves crossing two F1 hybrids from two different single crosses. It is a combination of two single crosses.
- **Dihybrid Cross**: This involves a cross between two organisms that are both hybrid for two traits.
- **Tetrahybrid Cross**: This refers to a cross involving four traits, but it typically involves two organisms that are hybrid for four traits.
- **Tetraploid Cross**: This involves organisms with four sets of chromosomes.

4. **Applying the Knowledge**:
- Since we are dealing with four inbred lines, the most appropriate term is "double cross". This is because the inbred lines can be crossed in pairs to create hybrids, which can then be crossed again.

5. **Conclusion**:
- Therefore, the correct answer to the question is **double cross**.

### Final Answer:
The cross of four inbred/pure lines of maize is termed as a **double cross**.

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