Lesson 7: Allele Frequency — Hardy-Weinberg Calculator
Learning Objective: Apply the Hardy-Weinberg equations to calculate genotype and allele frequencies in a population
p
+
q
= 1 (allele frequencies)
p
² + 2
pq
+
q
² = 1 (genotype frequencies)
Mode 1: Given p and q
p (dominant allele frequency)
q (recessive allele frequency)
Calculate
Homozygous Dominant (AA)
p²
Heterozygous (Aa) — Carriers
2pq
Homozygous Recessive (aa)
q²
Mode 2: Given phenotype frequency (find p and q)
Cystic Fibrosis (1/2500)
PKU (1/10000)
Albinism (1/20000)
Frequency of affected individuals (q²)
Or 1 in
Calculate
q (recessive allele)
√q²
p (dominant allele)
1 - q
Carrier frequency (2pq)
2pq