An out-cross is produced when animals

Options

A. Within the same breed having common ancestors are mated
B. Within the same breed having no common ancestors on either side of their pedigree upto 4-6 generations are mated
C. Of different breeds are mated
D. of different species are mated

Answer

### Step-by-Step Solution:

1. **Understanding Outcrossing**: Outcrossing refers to the breeding of animals within the same breed but with no common ancestors for a certain number of generations.

2. **Identifying the Correct Definition**: The key characteristic of outcrossing is that the animals being mated do not share common ancestry. This means they should not have any common ancestors on either side of their pedigree for up to 4 to 6 generations.

3. **Evaluating the Options**:
- **Option 1**: Within the same breed having common ancestors - Incorrect, as outcrossing requires no common ancestry.
- **Option 2**: Within the same breed having no common ancestors on either side of the pedigree up to 4 to 6 generations - Correct, as this aligns with the definition of outcrossing.
- **Option 3**: Up to 4 to 6 generations are mated - This is vague and does not specify the need for no common ancestors.
- **Option 4**: Of different breeds are mated - Incorrect, as this refers to crossbreeding, not outcrossing.
- **Option 5**: Of different species are mated - Incorrect, as this refers to interspecific hybridization.

4. **Conclusion**: Based on the definitions and evaluations, the correct answer is **Option 2**: "within the same breed having no common ancestors on either side of the pedigree up to 4 to 6 generations are mated."