vocabulary
Across
- 4. theory that states that speciation occurs suddenly and rapidly followed by long periods of little evolutionary change
- 5. one uncommon phenotype is selected over a more common phenotype
- 7. proportion of one allele compared with all the alleles for that trait in the gene pool
- 9. intermediate phenotypes are selected over phenotypes at both extremes
- 11. genetic drift that results from an event that drastically reduces the size of a population
- 13. isolation between populations due to physical borders
- 15. populations allele frequencies for a given trait to not change from generation to generation
- 16. collection of alleles found in all of the individuals of a population
- 18. evolution of two or more species from one ancestral species
- 19. one or more closely related species into different species resulting from adaptations to different environmental conditions
- 21. different kinds of living organisms are thought to have developed and diversified from earlier forms
- 22. certain traits enhance mating success traits are passed on to offspring
- 24. related to time such as differences in mating periods or differences in the time of day that individuals are most active
- 25. change in allele frequencies due to chance alone,most commonly in small populations
Down
- 1. two opposite, equally uncommon, phenotypes are selected over the most common
- 2. similar characteristics in unrelated species resulting from adaptations to similar environmental conditions
- 3. members of isolated populations are either no longer able to mate or no longer to produce viable offspring
- 6. allele frequency is highest near the mean range and decreases toward each extreme end
- 8. one species evolves and gives rise to many descendant species that occupy different ecological niches
- 10. differences in courtship or mating behavior
- 12. two or more species endure in response to changes in each other
- 14. observable change in the allele frequencies of a population over a few generations
- 17. physical movement of alleles from one population to another
- 20. elimination of a species from earth
- 23. genetic drift that occurs after a small number of individuals colonize a new area