Evolutionary Change

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Across
  1. 3. all of the genes that are present in a population
  2. 5. principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
  3. 6. type of reproduction in which cells from two parents unite to form the first cell of a new organism.
  4. 7. A change in allele frequency following a dramatic reduction in the size of a population
  5. 8. separation of a species or population so that they no longer interbreed and evolve into two separate species
  6. 11. trait controlled by one gene that has two alleles
  7. 13. Process by which two species evolve in response to changes in each other
  8. 14. an early stage in the development of an organism
  9. 18. 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. 19. process by which a single species or a small group of species evolves into several different forms that live in different ways
  11. 23. the evolution of a species by gradual accumulation of small genetic changes over long periods of time
  12. 24. form of reproductive isolation in which two populations reproduce at different times
  13. 27. trait controlled by two or more genes
  14. 29. The form of natural selection in which individuals at one end of a distribution curve have a higher fitness than individuals in the middle or at the other end of the curve.
  15. 30. sum total of all the different forms of genetic information carried by a particular species, or by all organisms on Earth
  16. 31. The remains or trace of an organism that lived in the past age.
  17. 32. The 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
  18. 33. Process by which unrelated organisms independently evolve similarities when adapting to similar environments
  19. 34. the study of embryos
Down
  1. 1. Formation of new species
  2. 2. Form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding.
  3. 4. Pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
  4. 9. event during which many species become extinct during a relatively short period of time
  5. 10. change in allele frequencies as a result of the migration of a small subgroup of a population
  6. 12. the movement of genes into or out of a population
  7. 15. a means of identifying the age of a fossil or rock by comparing it to other fossils or rocks.
  8. 16. changes in anatomy, phylogeny, ecology, and behavior that take place in clades larger than a single species
  9. 17. form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water
  10. 20. Number of times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
  11. 21. body parts of organisms that are similar in structure and position but may have different functions.
  12. 22. extinction caused by slow and steady process of natural selection
  13. 25. Body parts that share a common function, but do not have a similar structure
  14. 26. a means of measuring the age of a material by comparing the amount of radioactive form of an element contained in the material with the amount of its decay product.
  15. 28. situation in which allele frequencies in a population remain the same