Evolution Across 2. Principle or idea that allele frequency will remain constant unless one or more factors cause those frequencies to change 3. A situation in which the allele frequencies in a population do NOT change and the population does NOT EVOLVE 9. Type of selection in which individuals at both ends of the distribution curve have higher fitness than those near the middle 11. Preserved remains of an ancient organism 14. Inherited characteristic that increases an organism's chance for survival 16. Breeding by humans of plants or animals with certain useful traits 17. Idea that organisms that are best suited to their environment will survive and reproduce 18. Change in a population over time which also changes the genes in the gene pool 19. Islands that Darwin visited on his voyage on the Beagle that lead him to thinking about how organisms change over time 20. Ability of an organism to survive and reproduce in a specific environment 21. A change in the allele frequencies due to the migration of a small subgroup of a population to a new place 23. Type of evolution in which unrelated organisms independently evolve similarities when adapting to similar environments 24. Type of evolution by which organisms evolve differences when they are isolated in different environments 25. French naturalist who hypothesized that organisms acquire traits during their lifetime through use or disuse which can be passed on to their offspring 26. A change in DNA sequence caused by a mistake in DNA replication or exposure to radiation or chemicals 27. Organ with little or no known function such as the appendix

Down 1. Book published by Charles Darwin in which he proposed a mechanism for his theory of evolution 4. Also called survival of the fittest 5. Changes in the allele frequency in a small population that is due to random chance & don't follow the laws of probability 6. English economist that reasoned that if the human population kept growing unchecked that there would not be enough food and space 7. Type of selection in which individuals at one end of the distribution curve have higher fitness than individuals in the middle or at the other end 8. A group of one type of reproductively isolated organisms 9. Concept that each living species has descended with changes from other species over time 10. Naturalist who gave Darwin the incentive to publish his ideas about evolution by writing an essay that suggested similar ideas 12. One of the two geologists that proposed that the Earth has changed over millions of years and the processes that caused the change are still happening 13. Natural differences among individuals in a species 15. Structures that have developed fro the same embryonic tissue but have different functions 19. All the genes and alleles in a population 22. Type of selection where individuals near the center of a distribution curve have higher fitness than those at the extremes