Across
- 3. Alterations in surroundings that can affect survival and evolution
- 6. The physical characteristics expressed by an organism
- 8. The process of choosing organisms with desired traits to reproduce
- 9. Differences between individuals of the same species
- 11. The process by which genetic information is passed from parents to offspring
- 13. A group of organisms that can interbreed and produce fertile offspring
- 15. A structure made of DNA found in the nucleus of cells
- 17. A feature that helps an organism survive in its environment
- 18. When a species no longer exists
- 19. An allele that shows its effect even if only one copy is present
Down
- 1. The process where organisms better adapted to their environment survive and reproduce
- 2. The preserved remains or traces of ancient organisms
- 3. The gradual change in species over time
- 4. An allele that only shows its effect when two copies are present
- 5. The scientist who proposed the theory of evolution by natural selection
- 7. The genetic makeup of an organism
- 10. Different versions of the same gene
- 12. A section of DNA that codes for a specific characteristic
- 14. The molecule that carries genetic information in living organisms
- 16. A change in the DNA sequence of an organism