This selection pressure favors the extreme phenotypes, dividing the population into 2 distinct groups
Disruptive Selection
This mechanism of evolution occurs when individuals migrate between populations.
Gene Flow
True/False: Genetic drift is change in the allele frequency of a population due to a random, chance event.
TRUE
The type of genetic drift that follows the colonization of a new habitat by a small group of individuals is called
Founder Effect
All of the genetic information (all of the alleles) found in a population.
Gene pool
What does this image represent?
the Founder effect
There are two types of genetic drift, founder effect and the ________________ .
Bottleneck effect
Natural selection acts directly on (genotype/phenotype) - choose one
Phenotype!
Any change in the genetic material (DNA) of a cell is called a
Mutation
The frequency of phenotypes for a typical polygenic trait is most often shown as
Bell Curve
This selection pressure favors ONE of the extreme phenotypes (one side of the bell curve) , which shifts allele frequencies to one side or the other
Directional Selection
A group of organisms that can mate with each other and produce fertile offspring are called a
Species
Temporal isolation occurs when two different parts of the population reproduce at different _______________ .
Times
This occurs when 2 populations can no longer interbreed
Reproductive isolation
In this type of natural selection, individuals with intermediate traits (the average/middle) are more likely to survive and reproduce
Stabilizing
This is a mechanism of evolution in which allele frequencies of a population change over generations due to chance, NOT fitness
Genetic Drift
