Across
- 5. drift, changes allele frequency in population by random chance
- 6. or traces of organisms from past
- 7. species, found at a certain geographic location and nowhere else
- 8. study of fossils
- 10. selection, changes allele frequency in a population because adaptations are favored and increase fitness
Down
- 1. in species over time
- 2. remove genes from a population
- 3. of fossils, A fossil that shows an intermediate state between an ancestral trait and that of its later descendants
- 4. geographic distribution of a species
- 9. flow,changes allele frequency in a population by adding new genes by immigration and emigration