Chapter 5: Evolution of Biodiversity - Lesson 2: Biodiversity & Evolution

Chapter 5: Evolution of Biodiversity - Lesson 2: Biodiversity & Evolution


Describe the ways in which evolution can occur.

Evolution can occur through artificial selection, natural selection, or random processes.  Artificial selection occurs when humans determine which individuals will mate and pass on their genes to the next generation to achieve a predetermined suite of traits.  Natural selection does not favor a predetermined suite of traits, but simply favors those individuals that are best able to survive and reproduce.  Random processes (mutation, genetic drift, bottleneck effects, and founder effects) do not favor a predetermined suite of traits, nor do they favor individuals with the highest fitness.

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Chapter 5 Lesson 2 Sticky Note Video

Genes and Biodiversity

How does the gene pool contribute to biodiversity? Learn how genetic diversity within populations contributes to species survival.

Five fingers of evolution - Paul Andersen

How can a "thumbs up" sign help us remember five processes that impact evolution? The story of the Five Fingers of Evolution gives us a clever way of understanding change in gene pools over time.

Myths and misconceptions about evolution - Alex Gendler

How does evolution really work? Actually, not how some of our common evolutionary metaphors would have us believe. For instance, it's species, not individual organisms, that adapt to produce evolution, and genes don't "want" to be passed on -- a gene can't want anything at all! Alex Gendler sets the record straight on the finer points of evolution.

Chapter 5 Lesson 2 WSQ

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