Human Evolution Exam 1 Study Guide
Solutions
Natural Selection: - ANSWER-1. All species are capable of producing offspring at a faster rate than
food supplies increase
2. Because in each generation more individuals are produced than can survive, there is a competition for
limited resources
1....
Gene Flow: - ANSWER✔✔-- use of codons to make certain proteins
- some proteins can be created by several different nucleotide makeups, codons
- redundancy helps protect against a mutation / mistake
- we only need 20 amino acids, so we don't need a more complex system than three base codons /
triplet codons
• The exchange of alleles between populations
• Migration
• Systematic
• Increases variation within populations
• Decreases variation between populations
Genetic Drift: - ANSWER✔✔-- Change in allele frequencies produced by random factors
- Increases variation between populations
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