In the populations of Europe, out of 20,000 people, one is albino. Determine the genotypic structure of the population.

1) Find the frequency of recessive homozygotes (g2) in fractions of one:
g2 = 1/20 000 = 0.00005,
then the frequency of the recessive allele a will be:
2) Determine the frequency of the dominant allele A:
p = 1 – 0.007 = 0.993
3) Determine the frequency of the AA genotype, that is, p2:
p2 = 0.9932 = 0.986
4) Determine the frequency of the Aa genotype, that is, 2рg:
2pg = 2 x 0.993 x 0.007 = 0.014
5) We describe the genotypic structure of the European population:
0.986 AA: 0.014 Aa: 0.00005 aa, or per 20,000 people:
19 720 AA: 280 Aa: 1 aa
Answer: 0.986 AA: 0.014 Aa: 0.00005 aa, or 19 720 AA: 280 Aa: 1 aa3

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