Across
- 2. when allele frequency is high in the mean range and decreases toward each extreme
- 5. evolution of one or more closely related species into different species
- 12. when 2 opposite, uncommon phenotypes are selected over the most common phenotype
- 13. elimination of a species from Earth
- 14. when members of isolated populations aren't able to reproduce or mate or produce viable offspring
- 15. process when 2 or more species evolve in responses to change in each other
- 16. collection of alleles
- 18. isolation due to barriers related to time
- 19. the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth
- 20. isolation due to differences of mating behavior
- 22. evolution towards similar characteristics in unrelated species
- 23. observable change in the allele frequencies of a population over a few generations
- 24. genetic drift that occurs after a small number of individuals colonize a new one
- 25. when certain traits enhance mating success
Down
- 1. when one uncommon phenotype is selected over the most common phenotype
- 3. theory that says speciation occurs rapidly and is followed by long periods of small evolutionary changes
- 4. proportion of one allele compared with all the alleles for that trait in one gene pool
- 6. when intermediate phenotypes are selected over phenotypes at both extremes
- 7. change in allele frequencies
- 8. when a populaton's allele frequencies for a given trait do not change from generation to generation
- 9. isolation between populations due to physical barriers
- 10. physical movement of alleles from one population to another
- 11. evolution of 2 or more species from one ancestral species
- 17. when one species evolves and gives rise to descendant species that have different niches
- 21. genetic drift that results from an event that reduces the size of the population