Across
- 3. adaptive _______ occurs when a single species differentiated into many species rather quickly because of rather diverse ecological environments
- 5. ______ evolution is when two unrelated species develop similar traits because they face similar circumstance, even though there is no gene flow between the two species, and the species live at different times or places.
- 6. this takes place when a random event, such as asteroid collision, wipes out most organisms at random, thus changing the allele frequency.
- 8. a type of equilibrium where a species remains relatively stable over long geological periods of time, and then evolves rather quickly due to a rapid change in environment.
- 9. _______ selection takes place when an extreme version of a trait makes you much more likely to survive and reproduce
- 10. an isolating mechanism that keeps a gene out of a gene pool by reducing an offspring's chances of survival or reproduction
- 12. _______ selection takes place when you are more likely to survive if you are average
- 14. a type of speciation that occurs because of the development of some geographical boundary such as a mountain or river
- 15. _________ takes place when a trait increases an organisms ability to attract a mate. Peacock feathers are an example of this.
- 16. ________ this effect takes place when a small population of reproducing organisms migrate to somewhere else, thus making a drastic change in the allele frequency
- 17. speciation a type of speciation that occurs for a reason other than the development of a physical or geographical barrier
Down
- 1. ________ takes place when the allele frequency changes because of a random event
- 2. an isolating mechanism that keeps a gene out of a gene pool prior to fertilization
- 4. this term describes a situation where a change in one species drives the evolution of another species because the two species interact so much, in some way
- 7. _________ takes place when the allele frequency is the same from generation to generation
- 11. _______ selection takes place when it's "better to be black or white than to be gray"
- 13. a school of though about evolution that posits that evolution takes place in small, gradual steps