chapter 17

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Across
  1. 2. change in the genetic material of a cell
  2. 4. scientific study of heredity
  3. 6. change in allele frequency following a dramatic loss of population
  4. 7. a trait controlled by one gene that has two alleles
  5. 8. change over time
  6. 10. reproductive isolation in 2 or more species reproduce at the different times
  7. 11. breed and reproduce fertile offspring
  8. 15. separation of a species that can no longer interbreed
  9. 16. any necessity of life, such as water, nutrients, light, food, or space
  10. 17. random change in the frequency of the alleles in a gene pool
Down
  1. 1. a trait controlled by two or more genes
  2. 3. specific characteristic of an individual
  3. 5. allele frequencies in a population remain the same
  4. 9. contains all the alleles of all the genes in a population
  5. 12. change in allele frequency that results from a small group starting a new population
  6. 13. number of times an allele occurs in a gene pool
  7. 14. uses mutation rates in DNA to estimate how long 2 organisms shared common ancestor
  8. 18. well-tested explanation