Biology Evolution Unit Vocabulary

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Across
  1. 3. a change in allele frequency following a dramatic reduction in the size of a population
  2. 4. form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding
  3. 5. random change in allele frequency caused by a series of chance occurrences that cause an allele to become more or less common in a population
  4. 7. principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
  5. 10. when individuals select mates based on heritable traits
  6. 12. 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
  7. 16. change in allele frequencies as a result of the migration of a small subgroup of a population
  8. 18. how well an organism can survive and reproduce in its environment
  9. 20. natural selection in which individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle of the curve
  10. 24. all the genes, including all the different alleles for each gene, that are present in a population at any one time
  11. 25. change over time; the process by which modern organisms have descended from ancient organisms
  12. 26. the study of past and present distribution of organisms
  13. 27. formation of a new species
  14. 28. form of reproductive isolation in which two or more species reproduces at different times
  15. 29. a group of homeotic genes clustered together that determine the head to tail identity of body parts in animals. All Hox genes contain the homeobox DNA sequence.
Down
  1. 1. structure that is inherited from ancestors but has lost much or all of its original function
  2. 2. 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
  3. 6. heritable characteristic that increases an organism's ability to survive and reproduce in an environment
  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. 11. process by which organisms that are most suited to their environment survive and reproduce most successfully; also called survival of the fittest
  7. 13. the movement of genes into or out of a population
  8. 14. 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
  9. 15. 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
  10. 17. selective breeding of plants and animals to promote the occurrence of desirable traits in offspring
  11. 19. a trait controlled by a singular gene
  12. 21. body parts that share a common function, but not structure
  13. 22. trait controlled by two or more genes
  14. 23. preserved remains or traces of ancient organisms