Natural Selection

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Across
  1. 2. the study of past and present distribution of organisms
  2. 5. form of reproductive isolation in which two or more species reproduces at different times
  3. 7. form of natural selection when individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve
  4. 8. situation in which allele frequencies in a population remain the same
  5. 9. structures that are similar in different species of common ancestry
  6. 12. selective breeding of plants and animals to promote the occurrence of desirable traits in offspring
  7. 14. the movement of genes into or out of a population
  8. 15. heritable characteristics that increases an organism’s ability to survive and reproduce in an environment
  9. 18. trait controlled by one gene that has two alleles
  10. 19. form of natural selection in which individuals near the center of a distribution curve have higher fitness than individuals at either end of the curve
  11. 21. form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding
  12. 23. how well an organism can survive and reproduce in its environment
  13. 25. process by which organisms that are most suited to their environment survive and reproduce most successfully; also called survival of the fittest
  14. 26. formation of a new species
  15. 27. body parts that share a common function, but not structure
  16. 29. change over time; the process by which modern organisms have descended from ancient organisms
  17. 30. separation of species or population so that they no longer interbreed and evolved into two separate species
Down
  1. 1. a change in allele frequency following a dramatic reduction in the size of a population
  2. 3. change in allele frequencies as a result of the migration of a small subgroup of a population
  3. 4. form of reproductive isolation in which two populations are separated by geographic barriers such as rivers, mountains, or bodies of water, leading to the formation of two separate subspecies
  4. 6. the number of times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
  5. 10. principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
  6. 11. natural selection in which individuals at the upper and lower ends of the curves have higher fitness that individuals near the middle of the curve
  7. 13. when individuals select mates based on heritable traits
  8. 16. trait controlled by two or more genes
  9. 17. all the genes, including all the different alleles for each gene, that are present in a population at any one time
  10. 20. structure that is inherited from ancestors but has lost much or all of its original function
  11. 22. a group of homeotic genes clustered together that determine the head to tail identity of body parts in animals. All Hox genes contain the homie box DNA sequence
  12. 24. preserved remains or traces of ancient organisms
  13. 28. random change in allele frequency caused by series of chance occurrences that cause an allele to become more or less common in a population