Across
- 2. selection where one extreme phenotype is favored over another
- 7. selection where both extremes are favored and can lead to the development of two separate species
- 9. how well an organism can survive and reproduce in its environment
- 11. process where humans breed a species for a specific trait or characteristic
- 14. the process of change over time
- 17. change in allele frequencies due to chance within a population
- 18. structures that have lost their use through evolution
- 19. the study of how organisms develop
- 20. a branching diagram that shows cladistic relationships between a number of species
- 22. an ancestor shared by two or more lineages
- 23. different physical features in organisms that do not have a common ancestor yet they serve the same function
Down
- 1. allele frequencies change when some organisms move to a new area
- 3. similar physical features in organisms that share a common ancestor yet have completely different functions
- 4. selection against both extremes that strengthens the average trait
- 5. process where organisms with the best fitness survive and reproduce
- 6. development of a new species that must be able to interbreed and have offspring that can reproduce
- 8. distinctive fossils used to establish and compare the relative ages of rock layers and fossils
- 10. developed a theory of evolution through common ancestors
- 12. states that layers on the bottom will always be older than layers above them
- 13. preserved remains or traces of ancient organisms
- 15. an organism with a backbone or spinal column
- 16. change in allele frequencies due to random chance
- 21. any heritable characteristic that increases an organism's ability to survive and reproduce