Mechanisms of Evolution 16.1 Causes of microevolution

Mechanisms of Evolution

16.1 Causes of microevolution

What is microevolution? Evolution within a population Example: industrial melanism Best current day examples

antibiotic resistance Flu virus

What are some causes of microevolution—1? Genetic mutations

Increases diversity Gene flow

More gene flow = less diversity

Nonrandom mating Inbreeding decreases

diversity Assortative mating Sexual selection

Genetic drift Random change in allele

frequencies

What are some causes of microevolution—2? Bottleneck effect

Antibiotic resistance Founder effect

MRSA infection

Mechanisms of Evolution

16.2 Types of selection

What are the three types of natural selection—1? Review on your own

the requirements of natural selection

Directional Stabilizing Disruptive

What are the three types of natural selection—2? Stabilizing selection

What are the three types of natural selection—3? Disruptive selection