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