Diallel Cross Definition
Crossing of two or more lines in all possible combinations is known as-
- Diallele cross — Correct Answer
- Outcrossing
- Crisscross
- Top-crossing
Explanation:
Correct Answer: Diallele cross
A Diallele cross involves crossing two or more lines in all possible combinations, including reciprocal crosses, to evaluate general and specific combining abilities (GCA and SCA).
Comparison of Cross Types
| Cross Type | Definition | Purpose |
|---|---|---|
| Diallele cross | All possible combinations among multiple lines | Estimate GCA and SCA; used in swine and poultry |
| Top crossing | Mating of pure-bred (inbred) male with unrelated females | Like grading-up but for one generation |
| Out-crossing | Mating of unrelated animals of same breed | Simplest form of outbreeding |
| Criss-cross (2-way rotational) | Two breeds alternated as sires each generation | Maintain heterosis; 2-way rotational cross |
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
