unit 6 concepts 1-2

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Across
  1. 2. sexual selection increase the chance you will ___.
  2. 5. a slow constant change over time- peppered moths going from a light color to a darker color
  3. 6. individuals do not evolve, ___ do
  4. 8. any change in the DNA sequence
  5. 9. traits come from your ____
  6. 11. process of changing allele frequencies in a population over time
  7. 13. __ evoluton occurs when many species arise from one common ancestor- Lucy giving rise to great apes and humans
  8. 14. ___ evolution occurs when 2 unrelated species evolve the same traits- dolphin and sharks both have fins and streamlined bodies
  9. 18. ___ equilibrium is a burst of change followed by a period of stasis- the sudden appearance of new mammal species after mesozoic era
  10. 20. fitness is a measure of how well you can ___ in your environment
  11. 21. occurs when 2 species evolve together- gazelles run faster, cheetah becomes a better hunter
  12. 24. ___ traits will become more common in a population over time
  13. 25. true/false: DNA mutations are always beneficial
  14. 26. formation of a new species from an ancestor
  15. 27. the movement of alleles into/out of a population (2 words)
Down
  1. 1. a __ extinction occurs at a slow pace over time
  2. 3. a feature that allows an organism to better survive in its environment
  3. 4. genetic drift is the ____ change in allele frequency in a population
  4. 7. a group of organisms that can interbreed and produce viable, fertile offspring
  5. 8. occurs when a sudden event changes the evnironemnt and many species die
  6. 10. occurs when 2 unrelated species evolve the same traits because they live in the same type of environment
  7. 12. natural selection- organisms that are ____ fit for their environment will survive and reproduce at a higher rate
  8. 15. organisms will always ____ more offspring than the environment can support
  9. 16. differences in traits among the same species
  10. 17. the sources of genetic variation are: mutations, genetic____ and, migration
  11. 19. true/false: DNA mutations can result in a change in phenotype (physical trait)
  12. 22. all the alleles in a population (2 words)
  13. 23. evolution will NOT occur if the population is ___