Across
- 3. study of past and present distribution of organisms
- 4. form of natural selection in which individuals at one end of a distribution curve have higher fitness
- 5. change over time
- 8. survival of the fittest
- 10. all of the genes
- 11. number times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
- 13. how well an organism can survive and reproduce in its environment
- 15. a group of similar organisms that can breed and produce fertile offspring
- 17. body parts that share a common function but not structure
- 19. random change in allele frequency caused by a series of chance occurrences
- 20. structure that is inherited from ancestors but has lost much or all of its original function
Down
- 1. heritable characteristic that increases an organism's ability to survive and reproduce in an environment
- 2. structures that are similar in different species of common ancestry
- 6. trait controlled by two or more genes
- 7. form of natural selection in which individuals near the center of a distribution curve have a higher fitness
- 9. change in allele frequencies as a result of the migration of a small subgroup of a population
- 12. natural selection in which individuals at the upper and lower levels of the curve have higher fitness
- 14. preserved remains or traces of ancient organisms
- 16. trait controlled by one gene that has two alleles
- 18. formation of a new species