Across
- 2. graph that shows how related species are
- 4. structures that are similar in function but different anatomy; do not show common ancestry
- 5. made up of the same species
- 7. members of a populationn
- 11. when one species looks or resembles another that is harmful
- 13. random changes in DNA
- 14. looking for relationships in structure during embryotic stages
- 16. selection where one extreme trait is favored
- 17. selection when mating is not random
- 18. structures that no longer serve a purpose and may reduce in size over time
- 19. versions of a gene
Down
- 1. structures that have similar anatomy or bone layout but dufferent functions; show common ancestry
- 3. selection where middle or average trait is favored
- 6. selection where both extreme traits are favored
- 8. traits influenced by natural selection
- 9. distribution of species
- 10. blending into an environment in order to avoid predators
- 12. population size with no genetic drift
- 15. unit of inheritance
- 17. population size with genetic drift.