Natural Selection
Across
- 4. The variety of different types of genes in a species or population.
- 6. A species that no longer has any known living individuals.
- 13. fossils that show a transition from one species to another
- 15. organisms produce more offspring than can survive
- 16. Any difference between individuals of the same species.
- 18. ability to survive and reproduce
Down
- 1. A characteristic that improves an individual's ability to survive and reproduce in a particular environment.
- 2. A well-tested explanation for a wide range of observations or experimental results.
- 3. ancestor The shared ancestor of new, different species that arose from one population
- 5. Natural process resulting in organisms best adapted to the environment.
- 7. All the genes, including all the different alleles for each gene, that are present in a population at any one time
- 8. A statement that describes what scientists expect to happen every time under a particular set of conditions
- 9. The gradual change in a species over time
- 10. A group of similar organisms that can breed and produce fertile offspring.
- 11. English natural scientist who formulated a theory of evolution by natural selection (1809-1882)
- 12. change in a DNA sequence that affects genetic information
- 14. the formation of new species as a result of evolution
- 17. The preserved remains or traces of an organism that lived in the past