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Evolution
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Spicebush swallowtail larvae have markings that make them look like snake, helping to deter predators.
1. Genetic diversity:
Members of a population of organisms are not exactly alike, but have some genetic variation that can be passed on to the next generation ... like these beetles.
2. Natural selection:
In a given environment, some traits are better to have than are others. The
organisms in a population with the more favorable triats are better able to survive and reporduce, passing their favorable genes on to the next generation.
3. Time:
Over time, many generations, the population changes as unfavorable traits are selected against, and favorable traits becomemore prevalent in the population.
How Do I Use This Site?
What Is Biological Evolution? \e-və-lü-shən\
Evolution is a process that results in inheritable changes (genetic changes that can be inherited) in a population, spread over many generations. So, what is required for evolution to happen?
Page last updated: 1/2016
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More Evolution Resources
- Understanding Evolution website from University of California Museum of Paleontology.
- Evolution website from PBS.
- Fun Interactive Evolution Activity from the BBC's GCSE Bitesize.
- "Origins: How Life Began", video from NOVA.
- New NOVA Evolution website from PBS.
- Interactive Evolution Timeline from John Kyrk.
- "Darwinvaganza" Radiolab episode from WNYC.
- Charles Darwin Biography episode.
- Voyage of the Beagle, by Charles Darwin. Audio reading from LibriVox.
- "In Defense of Darwin" Radiolab episode featuring Richard Dawkins.
Antibiotic resistance in microbes happens when a microbial population with genetic variation is selected against (killed) through the use of an antibiotic.
Any variant that is resistant to the antibiotic will survive and reproduce. Whereas, microbes without that resistance gene are eliminated. Over time this leads to microbes that are increasingly difficult to kill.
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FREE teaching materials on biological evolution including lecture PowerPoints & homework assignments.
