Correct Matching of Cross Types
Which of the following pairs is correctly matched regarding types of crosses?
- Test cross = F1 hybrid × Homozygous dominant parent
- Out cross = F1 hybrid × Homozygous recessive parent
- Back cross = F1 hybrid × Any of the homozygous parents; Test cross = F1 hybrid × Homozygous recessive parent; Out cross = F1 hybrid × Homozygous dominant parent — Correct Answer
- Back cross = F1 hybrid × Homozygous recessive parent only
Explanation:
Correct Answer: Back cross = F1 × any homozygous parent; Test cross = F1 × homozygous recessive; Out cross = F1 × homozygous dominant
Types of Crosses
| Cross Type | Definition |
|---|---|
| Back cross | F1 hybrid × Any of the homozygous parents (TT or tt); includes both test cross and out cross |
| Test cross | F1 hybrid × Homozygous recessive parent (Tt × tt) |
| Out cross | F1 hybrid × Homozygous dominant parent (Tt × TT) |
Memory tip: Back cross = umbrella term; Test cross = recessive parent (used to determine genotype of F1); Out cross = dominant parent.
📚 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.
