Across
- 4. change in allele frequencies as a result of the migration of a small subgroup of a population
- 6. evolution of a species by gradual accumulation of small genetic changes over long periods of time
- 7. 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
- 9. event during which many species become extinct during a relatively short period of time
- 12. of a new species
- 13. the genes, including all the different alleles for each gene, that are present in a population at any one time
- 14. 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
- 17. comprising related organisms that share common characteristics and are capable of interbreedin
- 22. body parts that share a common function, but not structure
- 24. (pl. genera)-- group of closely related species; the first part of the scientific name in binomial nomenclature
- 26. a change in allele frequency following a dramatic reduction in the size of a population
- 30. form of reproductive isolation in which two or more species reproduces at different times
- 31. evolutionary branch of a cladogram that includes a single ancestor and all its descendants
- 32. process by which unrelated organisms independently evolve similarities when adapting to similar environments
- 33. 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
- 34. extinction caused by slow and steady process of natural selection
- 35. of evolution in which long stable periods are interrupted by brief periods of more rapid change
- 36. A name used by scientists, especially the taxonomic name of an organism that consists of the genus and specie
Down
- 1. (pl. phyla)-- in classification, a group of closely related classes
- 2. change in allele frequency caused by a series of chance occurrences that cause an allele to become more or less common in a population
- 3. separation of a species or population so that they no longer interbreed and evolve into two separate species
- 5. form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding
- 8. principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
- 10. to the evolution of at least two species, which occurs in response to changes in other species (have a ecological interdependent relationship)
- 11. (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
- 15. (divergent evolution)-- process by which a single species or a small group of species evolves into several different forms that live in different ways
- 16. classification system in which each species is assigned a two-part scientific name
- 18. in classification, a group of closely related orders
- 19. in classification, a group of closely related families
- 20. when individuals select mates based on heritable traits
- 21. largest and most inclusive group in classification
- 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
- 25. of natural selection in which individuals near the center of a distribution curve have higher fitness than individuals at either end of the curve
- 27. diagram depicting patterns of shared characteristics among species
- 28. classification, a group of similar genera
- 29. trait that is controlled by only one gene.