Across
- 2. : A trait that is controlled by two or more gene, each with one or more alleles.
- 5. A type of isolation that involves separation of a species so that they no longer interbreed.
- 8. an environmental factor that affects the chance of survival of an organism; organisms with one phenotype are more likely to survive and reproduce than those with a different phenotype.
- 12. The reduction in a gene pool compared with the main populations of a species, resulting from only two or three individuals, with only selection of the alleles, in gene pool starting off a new population.
- 16. A period when the number of a species fall to very low level.
- 17. The gradual change in allele frequencies in a small population, where some alleles are lost or favored just by chance and not by natural selection.
- 19. The formation of new species
- 21. Non-living environmental factor
- 22. A type of natural selection that maintains relatively high frequencies of two different sets of alleles; individuals with intermediate features and allele set are not selected for.
- 24. A type of natural selection that tends to keep allele frequencies relatively constant over many generations.
- 25. A type of natural selection that causes a gradual change in allele frequency over many generations.
- 26. A type of isolation that is caused by the difference of mating seasons between two species that do not match up.
- 28. Living environmental factor
- 29. A type of variation in which differences between the individuals of a species in which each one belongs to one of a small number of distinct categories with no intermediates
- 30. A type of factor by which the environment of an organism affects its survival.
Down
- 1. A type of isolation that is caused by species developing a different courtship rituals or other behaviors.
- 3. Differences between the DNA base sequences of individuals within a species.
- 4. The ability of an organism to survive and reproduce.
- 6. : A type of selection when individuals select mates based on heritable traits and fitness.
- 7. A number of different genes at different loci that all contribute to a particular aspect of the phenotype.
- 9. The movement of genes into or out of a population.
- 10. A type of isolation that is caused by geographical factors.
- 11. A variation of differences between the observable traits of individuals within a species is called ...
- 13. The need for a resource by two organisms, when that resource is in short supply.
- 14. The continued existence of two or more different phenotypes in a species.
- 15. The situtation in which allele frequencies in population remain the same form one generation to the next.
- 18. A trait that is controlled by one gene that may have on or more alleles.
- 20. The selection process by which individuals with a particular set of alleles are more likely to survive and reproduce than those with other alleles; over time and many generations, the advantageous alleles become more frequent in the population.
- 23. A type of variation in which differences between individuals of a species in which each one can lie at any point
- 27. The complete range of DNA base sequences in all the organisms in a species or population.