Natural Selection on Single Gene Traits

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Presentation transcript:

Natural Selection on Single Gene Traits

Learning Objectives Explain how natural selection affects single-gene traits Describe what a polygenic trait is

Phenotype is Determined by Genotype The number of phenotypes produced for a given trait depends on how many genes control the trait

Single-Gene Trait A single-gene trait is controlled by a single gene that has two alleles. Only two phenotypes.

Natural selection on single-gene traits can lead to changes in allele frequency and evolution The allele for dark colored moths became more common in the gene pool

Evolution of the Peppered Moth YouTube Video Evolution of the Peppered Moth

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Turn to your neighbor and talk about what you think polygenic traits are. What is it? Which traits are polygenic?

Polygenic Trait A polygenic trait is controlled by more than one gene. More than two phenotypes.

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Polygenic Trait Height is an example of a polygenic trait.

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