Across
- 3. clock two species have been evolving independently
- 5. isolation population so that members can no longer interbreed
- 6. selection fitness than individuals at either end of the curve
- 8. effect dramatic reduction in the size of a population
- 9. selection individuals near the middle of the curve
- 11. isolation behaviors that prevent them from breeding
- 13. breed and produce fertile offspring.
- 15. drift allele to become more or less common
Down
- 1. frequency alleles in that pool for the same gene
- 2. selection the middle or at the other end of the curve
- 4. isolation two population are separated by geographic barriers
- 6. formation of a new species.
- 7. isolation two or more species reproduce at different times
- 10. trait two or more genes
- 12. gene one gene that has two alleles
- 14. pool population at any one time