Common variable names, as used in L567
Theoretical population genetics (one locus with two alleles: 1 and 2)
p
q
The frequency of allele one
The frequency of allele two. Equal to 1 – p.
W11
W12
W22
The fitness of the 11 homozygote. W11 = 1.
The fitness of the 12 heterozygote. W12 = 1 - hs.
The fitness of the 22 homozygote. W22 = 1 - s.
Mean fitness of the populations.
s
h
Little s. The selection coefficient.
The dominance coefficient. Note: the dominance coefficient is not the square
root of heritability.
The rate of mutation
u
Quantitative genetics
h2
H2
narrow sense heritability. h2 = (VA/VP)
Broad sense heritability. H2 = (VG/VP)
S
R
The selection differential. Capital S. Equal to cov(w, z)
The response to selection (also equal to
)
VA
VG
VP
VE
Additive genetic variance
Total genetic variance (VA is a proportion of VG)
Total phenotypic variation
Total variation due to the environment.
The variance in mid-parent values
Vz
Total phenotypic variation in trait z. This is the same as VP
var(z) Total phenotypic variation in trait z. This is just another way to write the
same thing
cov(w, z)
Covariance between fitness and trait value.
Slope of the regression of w (fitness) on z (the trait value).
d
a
-a
The dominance deviation, as used for calculating breeding values
The phenotype of the 11 homozygote, as used for calculating breeding values
The phenotype of the 22 homozygote, as used for calculating breeding values
The average effect of allele 1
The average effect of allele 2