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Unformatted text preview: “directional” about directional selection? 2. What happens to overall variation? 4. I f drought conditions continued, would overall 3. Do allele frequencies change? Explain. variation eventually NOT be normally distributed? 5. I f the environment changed and NONE of the alleles present conferred high fitness, what would happen? L ong‐term changes in this population: 6. What happened here?
7. and here?
8. and here? B. Stabilizing selection
Study organism: M ayflies males form mating swarms. Females fly into the swarms, copulate in the air, and then lay their eggs in water nearby. The study: document size of males in swarms and of males that copulate successfully. T he data: black bars = all males
open bars = copulating males Upshot: I f the environment is not changing very much over time, what pattern of selection are you likely to see?
I f the environment is changing dramatically over time, what pattern of selection are you likely to see?...
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This note was uploaded on 03/04/2014 for the course ENGLISH 131 taught by Professor Amaleqeiq during the Spring '09 term at University of Washington.
- Spring '09