Across
- 5. evolution of a species by gradual accumulation of small genetic changes over long periods of time
- 8. 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
- 11. classification, a group of similar genera
- 12. evolutionary branch of a cladogram that includes a single ancestor and all its descendants
- 13. pool–all the genes, including all the different alleles for each gene, that are present in a population at any one time
- 14. isolation– form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding
- 15. 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
- 16. 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
- 18. gene trait–a trait that is controlled by only one gene.
- 19. nomenclature– classification system in which each species is assigned a two-part scientific name
- 20. effect– change in allele frequencies as a result of the migration of a small subgroup of a population
- 21. name– A name used by scientists, especially the taxonomic name of an organism that consists of the genus and specie
- 24. 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
- 26. effect– a change in allele frequency following a dramatic reduction in the size of a population
- 27. equilibrium–pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
- 29. evolution– process by which unrelated organisms independently evolve similarities when adapting to similar environments
- 31. 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
- 32. principle– principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
- 33. (pl. genera)-- group of closely related species; the first part of the scientific name in binomial nomenclature
- 35. diagram depicting patterns of shared characteristics among species
Down
- 1. selection– when individuals select mates based on heritable traits
- 2. in classification, a group of closely related families
- 3. 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
- 4. (pl. phyla)-- in classification, a group of closely related classes
- 5. 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
- 6. comprising related organisms that share common characteristics and are capable of interbreedin
- 7. structures– body parts that share a common function, but not structure
- 9. of a new species
- 10. isolation– form of reproductive isolation in which two or more species reproduces at different times
- 17. to the evolution of at least two species, which occurs in response to changes in other species (have a ecological interdependent relationship)
- 22. extinction– extinction caused by slow and steady process of natural selection
- 23. 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
- 25. extinction– event during which many species become extinct during a relatively short period of time
- 28. isolation– separation of a species or population so that they no longer interbreed and evolve into two separate species
- 30. largest and most inclusive group in classification
- 34. in classification, a group of closely related orders