1. What is allele frequency?

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Allele frequency is the of
appearances of an in the
genotypes of given population
(compared to other alleles of the
gene).

For example, in ABO blood system
there three alleles (IA, IB i).
Considering a group three persons,
one with IAi, other IAIB and
ii, the frequency of allele IA in
this “” is 2/6, the frequency
the allele IB is /6 and the frequency
of allele i is 3/6.