Chapter 18

Objectives: Ch. 18 Evolution of Populations

18.1 

• • How is evolution defined in genetic terms?

  • What are the sources of genetic variation?

  • What determines the number of phenotypes for a given trait?

18.2 HS-LS 3-3, 4-3

• • How does natural selection affect single gene and polygenic traits?

  • What is genetic drift?

  • What conditions are required to maintain genetic equilibrium?

18.3  HS-LS 4-4

• • What types of isolation lead to the formation of new species?

  • What is a current hypothesis about Galapagos Finch speciation.