Across
- 4. the number of times an allele occurs in a gene pool compared to the total number of alleles in that pool for that same gene
- 5. many traits are controlled by two or more genes
- 6. structure inherited from ancestors lost much/all of original function due to different selection pressures acting on the descendant
- 8. the study of where organisms live now and where they and their ancestors lived in the past
- 9. the preserved remains or traces of ancient organisms
- 11. individuals at one end of a distribution curve have higher fitness than individuals in the middle/other end of the curve
- 13. a term used to refer to a species that has died out and has no living members
- 14. structures body parts that share common function, but not structure
- 15. the difference in rates of survival and reproduction
- 19. change in frequency following a dramatic reduction in the size of a population
- 21. describes how well an organism can survive and reproduce in its environment
- 25. situation in which allele frequencies change as a result of the migration of a small subgroup of a population
- 26. a kind of random change in allele frequency
- 27. two of more species reproduces at different times
- 28. two populations differences in courtship rituals or other behaviors that prevent them from breeding
- 29. a trait controlled by only one gene
- 30. process by which organisms with variations most suited to their local environment survive and leave more offspring
Down
- 1. they compare stretches of DNA to mark the passage of evolutionary time
- 2. when a population not evolving, allele frequencies in its gene pool does not change, population is in __________
- 3. a practice in which individuals select mates based on heritable traits, such as size, strength, or coloration
- 7. structures that are shared by related species and that have been inherited from a common ancestor
- 10. individuals near the center of a distribution curve have higher fitness than individuals at wither end of the curve
- 12. individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle of the curve
- 16. selective breeding of plants and animals to promote the occurrence of desirable traits in an offspring
- 17. two populations separated by geographic barriers (rivers/mountains/water) leading to the formation of two separate subspecies
- 18. all the genes, including all the different alleles for each gene, that are present in a population at any one time
- 20. the process of change over time
- 22. the formation of new species
- 23. any heritable characteristics that increases an organism's ability to survive and reproduce in its environment
- 24. a population or group of populations whose members can interbreed and produce fertile offspring