Across
- 1. In classification, a group of closely related families.
- 5. Principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change.
- 7. All the genes, including all the different alleles for each gene, that are present in a population at any one time.
- 9. Body parts that share a common function, but not structure.
- 11. Form of reproductive isolation in which two populations are separated by geographic barriers such as rivers, mountains, or bodies of water, leading to the formation of two separate subspecies.
- 12. Random change in allele frequency caused by a series of chance occurrences that cause an allele to become more or less common in a population.
- 13. Process by which unrelated organisms independently evolve similarities when adapting to similar environments.
- 14. When individuals select mates based on heritable traits.
- 16. Largest and most inclusive group in classification.
- 17. In classification, a group of closely related orders.
- 18. Diagram depicting patterns of shared characteristics among species.
- 19. Event during which many species become extinct during a relatively short period of time.
- 21. A name used by scientists, especially the taxonomic name of an organism that consists of the genus and species.
- 25. The evolution of a species by gradual accumulation of small genetic changes over long periods of time.
- 28. Change in allele frequencies as a result of the migration of a small subgroup of a population.
- 30. Form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding.
- 31. Pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change.
- 33. Form of natural selection in which individuals near the center of a distribution curve have higher fitness than individuals at either end of the curve.
- 34. Form of natural selection when individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve.
- 35. A trait that is controlled by only one gene.
- 36. Group of closely related species; the first part of the scientific name in binomial nomenclature.
Down
- 2. Separation of a species or population so that they no longer interbreed and evolve into two separate species.
- 3. A change in allele frequency following a dramatic reduction in the size of a population.
- 4. Classification system in which each species is assigned a two-part scientific name.
- 6. Refers to the evolution of at least two species, which occurs in response to changes in other species.
- 8. In classification, a group of similar genera.
- 10. Form of reproductive isolation in which two or more species reproduce at different times.
- 15. Extinction caused by slow and steady process of natural selection.
- 20. The number of times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene.
- 22. Evolutionary branch of a cladogram that includes a single ancestor and all its descendants.
- 23. Refers to the colloquial name of a taxon or species. It is the name known to the general public or is based on any language.
- 24. In classification, a group of closely related classes.
- 26. Process by which a single species or a small group of species evolves into several different forms that live in different ways.
- 27. Natural selection in which individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle of the curve.
- 29. Formation of a new species.
- 32. Classification comprising related organisms that share common characteristics and are capable of interbreeding.