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Chapter 17 Vocab

Chapter 17 Evolution

All the genes in a populaiton Gene Pool
number of times an allele occurs in a gene pool Allele Frequency
Tall pea plants or Short pea plants are an example. Single Gene Trait
An example of this trait is height in humans Polygenic Trait
Individuals with a polygenic trait have a higher fitness on one end of the bell curve Directional Selection
Individuals with a polygenic trait have a higher fitness near the center of the bell curve Stabilizing Selection
Individuals with a polygenic trait have a higher fitness on opposite ends of the bell curve than in the middle Disruptive Selection
A random change in allele frequency in a population Genetic Drift
Type of genetic drift after there is a dramatic reduction in size of a population, changing the allele frequency Bottleneck
Changes in the allele frequency as the result of the migration of a small subgroup of a population Founder Effect
Population is not evolving, allele frequency does not change Genetic Equilibrium
Allele frequencies in a population should remain constant, unless one or more factors cause them to change. Hardy Weinberg Principal
Selection of individuals based on traits such as size, color, strength Sexual Selection
Population where members of the group can interbreed and produce fertile offspring Species
The formation of a new species Speciation
When 2 populations no longer continue to interbreed reproductive isolation
Two populations no longer breed because of differences in courtship, communication, rituals, etc. Behavioral Isolation
Separation of populations created by physical barriers like rivers, mountains, bodies of water, etc. Geographic Isolation
2 populations no longer breed due to a difference in mating timing Temporal Isolation
differences in mutation rates of DNA are used to estimate the time that 2 species have been evolving independently molecular clock
Created by: jamesweide
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