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Bio Exam 3 Review - Allele and Genotypic Frequencies (Class 17)
Terms in this set (18)
when allele frequencies and genotype frequencies do NOT change from generation to generation
a set of individuals of the same species capable of interacting and successfully breeding
set of all alleles in a population
chance events that can cause allele frequencies to vary unpredictably from one generation to the next
when the environment increases on phenotype chance to survive and reproduce
-due to an adaptation
-those with a greater chance to survive and reproduce have a higher relative fitness
allele/genotype frequencies do not change from generation to generation
-if some genes are in equilibrium, most are not
The Genetic Makeup of population can...
change overtime if individuals with different alleles survive and reproduce at different rates
What are the five criteria that must be met for equilibrium to occur?
1. Large Breeding Population
2. Random Mating
3. No Gene Flow
4. No Gene Drift
5. No Natural Selection
How gene flow can affect the genetic makeup of a population?
two different breed of the same species mate and introduce new alleles in the population
How genetic drift can affect the genetic makeup of a population?
depending on the environment or the founders of a population, the population inherits a specific genotype
What are the two types of genetic drift?
1. Bottleneck Effect
2. Founder Effect
sudden drop in population survivors have different allele frequencies
subset of a population leaves and establishes new population, founders have different allele frequencies
How natural selection can affect the genetic makeup of a population?
one genotype or phenotype is preferred over the other so that the species can survive
What are the three modes of selection?
1. Directional Selection
2. Disruptive Selection
3. Stabilizing Selection
favors individuals at one extreme
favors individuals at BOTH extremes
favors individuals of intermediate phenotype
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