1. Allele frequencies when populations are NOT evolving
Hardy-Weinberg Rule
Allele frequencies when populations are NOT evolving

2. Hardy-Weinberg Rule
Allele frequencies will NOT change (stay in equilibrium) if the following conditions are met:
No mutation
Large population isolated from other populations of same species
Random mating
Individuals survive and reproduce equally

3. Hardy-Weinberg Rule When would we want to know this info?
It provides a yardstick by which changes in allele frequency can be measured.
You can see if a population is evolving

4. Hardy-Weinberg Rule Formula for the allele frequency is
p2 + 2pq + q2 = 1
P2 is AA
pq is Aa ( x 2 because aA also)
q2 is aa
You can use the formula to track alleles from one generation to the next to see if the gene frequencies are changing.
p= frequency of allele A
q= frequency of allele a
p+ q = 1

5. Hardy- Weinberg Rule
If you know the percent of homozygous recessive out of the total population, you know q2. Take the square root of it to find q. q is the frequency of a. Then you can find the rest.