NATURAL SELECTION Unit 3-2 Notes Mr. Hefti – Pulaski Biology.

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NATURAL SELECTION Unit 3-2 Notes Mr. Hefti – Pulaski Biology

A. Potential to produce more offspring than can possibly survive B. Populations remain stable C. Not all offspring survive to adulthood

 Insects  Fish  Amphibians  Puppies

A. Overproduction leads to competition for limited resources B. Best adapted most likely to survive and reproduce

 Long cold winter  Forest fire  Certain baby birds aggressive feeders

A. New traits from natural variations B. Trait helps organism survive and reproduce = adaptive value

 Fur lengths  Colors of moths  Antibiotic resistance or non-resistance

A. Adaptive value = competitive advantage B. The proportion of individuals with favorable traits increases (they are the better competitors) C. Adapting to change brings about evolution

 Giraffes’ long necks  Drought tolerant cacti  Omnivores eat a variety of foods