BIOLOGY GROUP ONE

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Across
  1. 2. : A trait that is controlled by two or more gene, each with one or more alleles.
  2. 5. A type of isolation that involves separation of a species so that they no longer interbreed.
  3. 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.
  4. 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.
  5. 16. A period when the number of a species fall to very low level.
  6. 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.
  7. 19. The formation of new species
  8. 21. Non-living environmental factor
  9. 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.
  10. 24. A type of natural selection that tends to keep allele frequencies relatively constant over many generations.
  11. 25. A type of natural selection that causes a gradual change in allele frequency over many generations.
  12. 26. A type of isolation that is caused by the difference of mating seasons between two species that do not match up.
  13. 28. Living environmental factor
  14. 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
  15. 30. A type of factor by which the environment of an organism affects its survival.
Down
  1. 1. A type of isolation that is caused by species developing a different courtship rituals or other behaviors.
  2. 3. Differences between the DNA base sequences of individuals within a species.
  3. 4. The ability of an organism to survive and reproduce.
  4. 6. : A type of selection when individuals select mates based on heritable traits and fitness.
  5. 7. A number of different genes at different loci that all contribute to a particular aspect of the phenotype.
  6. 9. The movement of genes into or out of a population.
  7. 10. A type of isolation that is caused by geographical factors.
  8. 11. A variation of differences between the observable traits of individuals within a species is called ...
  9. 13. The need for a resource by two organisms, when that resource is in short supply.
  10. 14. The continued existence of two or more different phenotypes in a species.
  11. 15. The situtation in which allele frequencies in population remain the same form one generation to the next.
  12. 18. A trait that is controlled by one gene that may have on or more alleles.
  13. 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.
  14. 23. A type of variation in which differences between individuals of a species in which each one can lie at any point
  15. 27. The complete range of DNA base sequences in all the organisms in a species or population.