BSC 196 Lecture 2: Bio- Lecture 2

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8 Feb 2017
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Wednesday, January 25, 2017
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Evolution of guppy color patterns
Evolution by Natural Selection
- Natural selection: some individuals reproduce more than others because of their
specific characteristics (phenotype)
Variation
Fitness differences
Inheritance
More offspring produced than can survive
Evolution of color patterns in mall guppies
- Enormous variation in color patterns
Mosaic of spots/patches vary with respect to size, color and number of spots
Color genes only expressed in males
In some populations, males are typically drab (cryptic); in others, they are highly
conspicuous
- Native in West Indies and Venezuela
- Observations:
Drab populations: intense predation
- Downstream locations
Colorful populations: predation risk absent
- Upstream locations
- HYPOTHESIS:
Color patterns have evolved through natural selection
Trade off between mate attraction and predator avoidance
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