Across
- 4. The ability of an organism to stay alive long enough to reproduce.
- 6. A structure in cells made of DNA containing many genes.
- 7. Differences between individuals of the same species.
- 10. A section of DNA that controls a characteristic.
- 12. An allele that shows its effect even if only one copy is present.
- 15. The gradual change in species over many generations.
- 16. Traits passed from parents to offspring through genes.
Down
- 1. A group of organisms that can reproduce and produce fertile offspring.
- 2. The young produced by parents.
- 3. Different versions of the same gene.
- 5. The surroundings in which an organism lives.
- 8. The chemical that carries genetic information in cells.
- 9. An allele that only shows its effect if two copies are present.
- 11. A feature that helps an organism survive in its environment.
- 13. selection The process where organisms best adapted to their environment survive and reproduce.
- 14. Man's best friend