1. No Mutations 2. Random Mating 3. No Gene Flow 4. Large Population Size 5. No Natural Selection
Tags
evolutionallelesgenotypespopulation genetics
p
q
p
q
AA (0.25)
Aa (0.25)
Aa (0.25)
aa (0.25)
Population Simulation (N=100)
Homozygous Dom (AA):25
Heterozygous (Aa):50
Homozygous Rec (aa):25
Phenotype Expressions
Dominant Trait:75
Recessive Trait:25
Dominant Allele Freq (p) 0.50
Recessive Allele Freq (q) 0.50
1.00 - p = 0.50
Genetic Drift Scenario
Notice how the recessive phenotype (\( q^2 \)) shrinks exponentially as \( q \) approaches 0, but the allele can perfectly hide in heterozygotes (\( 2pq \)). This makes recessive traits very hard to completely eliminate from a population.