Two-Breed Rotational Crossing
System of mating in which 2 breeds are crossed alternatively
- 2-way rotational cross / Criss-cross — Correct Answer
- 2-way cross
- Back cross
- None
Explanation:
Correct Answer: 2-way rotational cross / Criss-cross
When 2 breeds are crossed alternately (males of each breed used on crossbred females in rotation), it is called a 2-way rotational cross, also known as Criss-cross breeding.
Rotational Crossing Systems
| System | Breeds | Alternate Name |
|---|---|---|
| 2-way rotational cross | 2 | Criss-cross breeding |
| 3-way rotational cross | 3 | — |
Why Other Options Are Wrong
- 2-way cross: Simple cross between 2 breeds (Breed A × Breed B = F₁) — not a rotational system.
- Back cross: F₁ hybrid × any homozygous parent — used in Mendelian genetics, not a rotation system.
Cross-breeding Examples in Cattle
- Karanswiss: Brown Swiss × Sahiwal
- Jersindh: Jersey × Sindhi
- Frieswal: Holstein Friesian × Sahiwal
📚 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.
