Ultimate Source of Genetic Variation
The ultimate source of all genetic variation-
- Segregation
- Crossing over
- Mutation, Migration, Selection, Genetic drift
- All the above — Correct Answer
Explanation:
Correct Answer: All the above
All listed sources collectively contribute to genetic variation in populations. The question acknowledges both the ultimate origin (mutation) and the ongoing generators and modifiers of variation (segregation, crossing over, migration, selection, genetic drift).
Causes of Genetic Variation — Ranked
| Cause | Role | Magnitude |
|---|---|---|
| Segregation | Largest ongoing cause — reshuffles existing alleles into new combinations every generation | Biggest cause |
| Crossing over | Creates new combinations of linked alleles; adds to variation from segregation | 2nd biggest cause |
| Mutation | Ultimate source of ALL novel alleles — creates new alleles not previously existing | Slow but foundational |
| Migration, Selection, Genetic drift | Change frequencies of existing alleles; alter distribution of variation | Modifiers |
📚 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.
