Speciation Crossword
Across
4. Selection caused by changing environmental conditions shift so that individuals with alleles on one end of the range become more common
6. individuals leaving
11. genetic change
15. Development of life forms
16. Proposed the mechanism for evolution
17. individuals or groups that defend a territory against encroachment
18. Island chain off the coast of South America
19. change in the gene frequency in a population from one generation to the next.
21. The large scale, long-term genetic changes that result in a new species
23. Development of first organic molecules
Down
1. describes the small genetic changes that effect one characteristic of a population
2. An environmental factor which causes some individuals with certain traits to survive and reproduce more than the rest of the population.
3. Selection that favors individuals at the extremes and selects against those in the middle
5. individuals entering
7. Evolutionary change that allows an organism to survive and reproduce
8. Occurs when more than one organism strives for limited resources
9. Formation of 2 species from 1 as a result of divergent natural selection in response to changes in the environmental conditions
10. slow genetic change that occurs as the result of selective pressures
12. Selection that eliminates individuals on both ends of the range and favors those in the middle
13. Separation of populations of a species for long times into different areas
14. The ship that Darwin sailed on
20. role of an organism in the environment
22. the mechanism for evolution