Across
- 4. selection 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
- 5. formation of a new species
- 8. in classification, a group of similar genera
- 9. largest and most inclusive group in classification
- 12. isolation 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
- 14. pool all the genes, including all the different alleles for each gene, that are present in a population at any one time
- 18. equilibrium pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
- 20. in classification, a group of closely related families
- 21. gene trait a trait that is controlled by only one gene.
- 22. selection 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
- 25. principle principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
- 26. the evolution of a species by gradual accumulation of small genetic changes over long periods of time
- 27. refers to the evolution of at least two species, which occurs in response to changes in other species (have a ecological interdependent relationship)
- 29. isolation form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding
- 31. extinction event during which many species become extinct during a relatively short period of time
- 32. isolation form of reproductive isolation in which two or more species reproduces at different times
Down
- 1. name A name used by scientists, especially the taxonomic name of an organism that consists of the genus and specie
- 2. effect a change in allele frequency following a dramatic reduction in the size of a population
- 3. frequency (relative frequency) 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
- 5. selection 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
- 6. diagram depicting patterns of shared characteristics among species
- 7. structures body parts that share a common function, but not structure
- 10. (pl. genera) group of closely related species; the first part of the scientific name in binomial nomenclature
- 11. extinction extinction caused by slow and steady process of natural selection
- 13. effect change in allele frequencies as a result of the migration of a small subgroup of a population
- 15. evolution process by which unrelated organisms independently evolve similarities when adapting to similar environments
- 16. classification comprising related organisms that share common characteristics and are capable of interbreeding
- 17. isolation separation of a species or population so that they no longer interbreed and evolve into two separate species
- 19. drift 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
- 21. selection when individuals select mates based on heritable traits
- 23. name 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. evolutionary branch of a cladogram that includes a single ancestor and all its descendants
- 27. in classification, a group of closely related orders
- 28. (pl. phyla) in classification, a group of closely related classes
- 29. nomenclature classification system in which each species is assigned a two-part scientific name
- 30. radiation (divergent evolution) process by which a single species or a small group of species evolves into several different forms that live in different ways