Natural Selection and Evolution

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Across
  1. 4. gene _____ reduces genetic differences between populations over time
  2. 5. genetic _____ describes unpredictable changes in allele frequencies in a small population due to chance
  3. 8. a trait that increases individual fitness
  4. 10. a change in traits of individuals in a population over generations
Down
  1. 1. the ultimate source of new alleles
  2. 2. a group of individuals of the same species
  3. 3. similarity resulting from common ancestry
  4. 4. the relative survival and reproduction of one genotype
  5. 5. ____ characters are often a single gene with two different alleles
  6. 6. ______ selection is the selective breeding of plants and animals by humans
  7. 7. the distribution of species on Earth
  8. 9. gene _____ describes allele frequencies for a population at a specific point in time