Across
- 4. ____ ancestry; fundamental principle of modern evolutionary theory
- 5. portions of a DNA molecule which code for proteins
- 8. ____ selection; controlling the breeding of organisms to obtain the desired results in the offspring
- 11. ____ trait; a feature no longer having any apparent function
- 13. ____ selection; the driving force of evolution
- 14. evolution as a result of genetic changes that give rise to new species
- 16. any change in a characteristic which increases the ability of an organism to survive and reproduce
- 18. group of organisms of the same species living and reproducing in the same place at the same time
- 19. a hypothesis that has been tested extensively over time and explains a broad range of scientific data with high reliability
Down
- 1. modern ____; the union of genetics with evolutionary theory
- 2. remnants of organisms or structures found within rocks and layers of sediments
- 3. the change of an organism over time
- 4. organizing organisms into groups based upon their similarities
- 6. carbon 14 is an example of a radioactive ____; an atom of an element with a different number of neutrons; used to date fossils
- 7. the differences among individuals of the same species living in the same place at the same time
- 9. ____ tree diagram; often used to show relationships between modern organisms and their ancestors
- 10. evolution applying to whole groups of species often due to changing environments or major historical events
- 12. the distribution of organisms around the world
- 15. a change in the genetic code of an organism
- 17. the amount of time that it takes for 1/2 of a radioactive substance to become nonradioactive