Across
- 3. Formation of new species
- 5. When the allele frequency in a population changes due to random chance
- 6. Preserved remains of dead organisms that provide evidence of evolution
- 7. When organisms move in and out of a population, changing the allele frequency of the population
- 9. Type of natural selection where the moderate traits are selected against and the extreme traits are selected for
- 12. When speciation occurs in the presence of a physical barrier
- 15. When organisms choose mates based on proximity or desired traits, leading to changes in allele frequency
- 17. Diagram that shows evolutionary relationships between species
- 19. When several species quickly evolve from one founding species
- 20. Study of evolutionary relationships between species
- 22. Cumulative changes in species over time
- 23. Scientist who developed the theory of evolution by means of natural selection
- 24. Theory that evolution occurs in short bursts
- 25. Type of natural selection where the moderate trait is selected for and extreme traits are selected against
Down
- 1. When organisms in different parts of the world evolve a similar characteristic despite not sharing a common ancestor
- 2. Theory that evolution occurs gradually over time
- 4. When organisms that are better adapted to their environment reproduce more and the trait becomes more common in the population
- 8. Comparing embryos of organisms to determine if species share evolutionary history
- 10. When speciation occurs without a physical barrier present
- 11. Type of natural selection where one extreme trait is selected for
- 13. Trait that helps an organism survive
- 14. Changes in an organism's DNA code
- 16. Structures that look similar in different species that provide evidence that the species evolved from a common ancestor
- 18. Structures that no longer serve a purpose but provide evidence that a species evolved from another species
- 21. When the evolution of one species impacts the evolution of another species