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Sametra Williams
September 25, 2008
ANSC 4018
Homework #2
4.2.
Gene frequency is defined as the relative frequency of a particular allele in a population.
Genotypic frequency is defined as the relative frequency of a particular onelocus genotype in a
population. Calculation for gene frequency in a population for a simplyinherited trait affected by
a single locus can be done by calculating the dominant homozygous genotype (p^2), the
heterozygous genotype (2pq), and the recessive homozygous genotype (q^2); example:
p^2+2pq+q^2. After finding the numbers at genotypes, more work has to be done. These further
calculations can be done by multiplying the dominant homozygous by 2 (since it has 2 alleles at
that locus) and then adding it to ½ of the total of the heterozygous allele, then dividing this
amount by the total amount of individuals. This is the same for calculating q, except you take the
calculations from the homozygous recessive instead of the dominant. Rule of thumb: the
particular dominant homozygous allele (p) and the recessive homozygous allele (q) has to always
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 Spring '09
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