Across
- 2. Movement of genes between populations
- 5. Process favoring beneficial traits
- 7. Two species evolving in response to each other
- 9. Complete loss of a species
- 12. Unpredictable genetic differences
- 13. Reduction in population size
- 14. Trait improving survival and reproduction
- 15. Survival of the fittest
Down
- 1. Unrelated species evolving similar traits
- 3. Species evolving in different directions
- 4. Random changes in allele frequencies
- 6. Source of new genetic variation
- 8. Mutation with no effect on fitness
- 10. Formation of new species
- 11. Genetic change in a new population