Across
- 4. Species have different ancestral origins but have developed similar features
- 8. Both extreme phenotypes are favored
- 9. A change in DNA sequence.
- 10. frequency The percentage of any one specific allele.
- 11. Organisms evolve in response to to one another
- 12. Two separate species evolve differently from a common ancestor.
- 14. When populations are split apart by geographic isolation
Down
- 1. One extreme phenotype is favored
- 2. drift a change in the frequency of an allele within a population over time.
- 3. A group of individuals of the same species living in a particular area at the same time.
- 5. flow Any movement of genes from one population to another
- 6. selection A process whereby organisms better adapted to their environment tend to survive and produce more offspring.
- 7. Average phenotype is favored
- 13. pool All alleles of a population’s genes.