Ch. 13 How Populations Evolve

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Across
  1. 2. when nucleotide sequences of DNA have random changes and can result in new alleles
  2. 14. remnants of features that served important functions in the organism’s ancestors
  3. 15. Chance allows certain alleles to be represented more in survivors than other alleles that didn’t survive
  4. 17. populations gain or loses alleles when fertile individuals move in or out of he population or when gametes are transferred in between populations
  5. 19. individuals with particular traits are more likely than other individuals to mate
  6. 20. shifts in overall makeup of a population by selecting in favor of one extreme phenotype ex. Darkest fur color
  7. 21. contribution an individual makes to the gene pool of the next generation relative to the contributions of the other individuals
  8. 22. reduces physical variation and gets rid of more extreme phenotypes
  9. 23. where future generations will get their genes from
  10. 24. structure due to common ancestry
Down
  1. 1. Individuals in a population have many heritable traits that vary greatly
  2. 3. the combination of genetics with evolutionary biology
  3. 4. results from the establishment of small new populations whose gene pool is different from the parent population
  4. 5. comparison of body structures in different species
  5. 6. population is not evolving and in genetic equilibrium
  6. 7. a group of individuals of the same species living in the same place at the same time - can change over time
  7. 8. the pattern of descent showed
  8. 9. genetic composition of the population has changed over time / all of biological history of organisms that live on the Earth today
  9. 10. selection: changes in population genetics where values for a trait are favored over other values and divided into two groups
  10. 11. geographic distribution of species
  11. 12. change in a population’s frequency of alleles
  12. 13. Organisms with certain inherited traits are more likely to survive and reproduce than are individuals with other traits
  13. 16. a population’s increase in the frequency of traits suited to the environment
  14. 18. distinction in appearance