Across
- 1. Genetic drift that occurs after a small number of individuals colonize a new area
- 5. Process by which one species evolves and gives rise to many descendant species that occupy different ecological niches
- 6. Isolation between populations due to differences in courtship or mating behavior
- 8. Collection of alleles found in all of the individuals of a population
- 11. Theory that states that natural disasters shaped Earth's landforms and caused extinction of some species
- 12. Process in which two or more species evolve in response to changes in each other
- 13. Theory that states that speciation occurs suddenly and rapidly followed by long periods of little evolutionary change
- 14. Final stage in speciation, in which members of isolated populations are either no longer able to mate or no longer able to produce viable offspring
- 16. Study of the distribution of organisms around the world
- 18. Proportion of one allele, compared with all the alleles for that trait, in the gene pool
- 20. Physical movement of alleles from one population to another
- 22. Process by which humans modify a species by breeding it for certain traits
- 23. Inherited trait that is selected for over time because it allows organisms to better survive in their environment
- 25. All of the individuals of a species that live in the same area
- 26. Isolation between populations due to barriers related to time, such as differences in mating periods
- 27. Differences in physical traits of an individual from the group to which it belongs
- 29. Change in allele frequencies due to chance alone, occurring most commonly in small populations
- 31. Isolation between populations due to physical barriers
- 32. Study of fossils or extinct organisms
- 33. Evolution toward similar characteristics in unrelated species
- 34. Principle that states that changes in landforms result from slow changes over a long period of time
- 36. Evolution of one or more closely related species into different species
- 38. Evolution of two or more species from one ancestral species
- 39. Measure of an organism's ability to survive and produce offspring relative to other members of a population
- 40. Trace of an organism from the past
Down
- 2. Process of biological change by which descendants come to differ from their ancestors
- 3. Body part that is similar in function as a body part of another organism but is structurally different
- 4. Pathway of natural selection in which one uncommon phenotype is selected over a more common phenotype
- 7. Pathway of natural selection in which two opposite, but equally common, phenotypes are selected over the most common phenotype
- 9. Mechanism by which individuals that have inherited beneficial adaptations produce more offspring on average than do other individuals
- 10. Theory that states that the geologic processes that shape Earth are uniform throughout time
- 15. Ability of a trait to be passed from one generation to the next
- 17. Observable change in the allele frequencies of a population over a few generations
- 19. Genetic drift that results from an event that drastically reduces the size of a population
- 21. Remnants of an organ or structure that functioned in an earlier ancestor
- 24. Body part that is similar in structure on different organisms but performs different functions
- 28. Pathway of natural selection in which intermediate phenotypes are selected over phenotypes at both extremes
- 30. Elimination of a species from Earth
- 35. Group of organisms so similar to one another that they can breed and produce fertile offspring
- 37. Selection in which certain traits enhance mating success