|
Given (when population is in equilibrium) |
Find |
Calculate |
|
Allelic frequencies (p,q) |
|
p2, 2pq, q2 |
|
Frequency of dominant allele (p) |
(q) 1-p =q |
p2, 2pq, q2 |
|
Frequency of recessive allele (q) |
(p) 1-q =p |
p2, 2pq, q2 |
|
Frequency of recessive phenotype (q2) |
(q) and p √q2 = q 1-q =p |
p2, 2pq, |
|
Frequency of dominant phenotype |
Frequency of recessive phenotypes (q2) 1-dominant phenotype = q2 |
See above row |
|
Frequency of heterozygotes |
|
No calculations possible |
Sometimes you may have to calculate the frequency, for example, 64 of 400 exhibit the recessive phenotype.
You need to divide 64 by 400 to get a frequency of 0.16.
When a population is NOT in equilibrium, allelic frequencies must be CALCULATED. You cannot, for
example, take the square root of frequency of recessive phenotype to find frequency of q. You will have
to calculate allelic frequencies by dividing number of that allele present in the population by number of total
alleles in the population.