Across
- 3. Study of the past and present distribution of organisms.
- 5. The number of times that an allele occurs in a gene pool
- 7. Selective breeding
- 10. Separation of a species,no longer can interbreed.
- 12. Trait controlled by two or more genes.
- 13. Structures that are similar in function
- 17. Humans
- 18. Preserved remains or traces of ancient organisms.
- 19. A structure that is reduced in size.
- 20. New species
Down
- 1. All the genes in a population at one time
- 2. Result of the migration of a small group of a population
- 4. species are separated by a barrier
- 6. Allele frequencies remain the same.
- 8. Trait controlled by one gene, or has 2 alleles.
- 9. Structures similar in different species
- 11. How well an organism can reproduce and survive in its enviroment
- 14. Survival of the fittest
- 15. A heritable characteristic
- 16. A change over time