Chapter 13 Vocabulary

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Across
  1. 3. all the genes, including all the different alleles for each gene, that are present in a population at any one time
  2. 4. the selection of mates based on heritable traits
  3. 8. form of natural selection in which individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve
  4. 9. number of times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
  5. 11. a group of homeotic genes clustered together to determine the head to tail identity of body parts in animals
  6. 12. separation of a species or population so that they no longer interbreed and evolve into separate species
  7. 14. sum total of all the different forms of genetic information carried by a particular species, or by all organisms on earth
  8. 16. 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
  9. 17. change in allele frequencies as a resulr of the migration of a small subgroup of a population
  10. 18. formation of new species
  11. 19. form of reproductive isolation in which two or more species reproduce at different times
Down
  1. 1. form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding
  2. 2. trait controlled by two or more genes
  3. 5. 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
  4. 6. a change in allele frequency following a dramatic reduction in the size of a population
  5. 7. the movement of genes into or out of a population
  6. 10. form of reproductive isolation in which two populations are separated by geographic barriers such as rivers, mountains, or bodies of water leading to the formation of two separate subspecies
  7. 11. principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
  8. 13. situation in which allele frequencies in a population remain the same
  9. 15. trait controlled by one gene that has two alleles