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How Do You Calculate 2Pq?

Answer
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Hint: In population genetics, the Hardy–Weinberg principle, also known as the Hardy–Weinberg equilibrium, model, theorem, or rule, says that in the absence of additional evolutionary effects, allele and genotype frequencies in a population would stay constant from generation to generation.

Complete solution
The Hardy Weinberg equation may be used to determine allele and genotype frequencies in a population and to analyse any evolution-related changes. The anticipated genotype frequencies under random mating aref(AA) =p2for the AA homozygotes,f(aa) =q2for the aa homozygotes, andf(Aa) = 2pq for the heterozygotes in the simplest case of a single locus with two alleles labelled A and a with frequencies f(A) =p andf(a) =q , respectively. Allele frequencies p and q are constant between generations in the absence of selection, mutation, genetic drift, or other factors, indicating that equilibrium has been attained. G. H. Hardy and Wilhelm Weinberg were the first to illustrate the idea numerically. Hardy's work aimed to disprove the notion that a dominant allele would naturally rise in frequency. Hardy–Weinberg genotype frequencies tests are now largely used to look for population stratification and other non-random mating patterns.
It is given by the equation
p2+2pq+q2=1
Where
p2 = dominant homozygous frequency (AA)
2pq = heterozygous frequency (Aa)
q2 = recessive homozygous frequency (aa)
To calculate the 2Pq – frequency of Aa (heterozygous).
We use
p2+2pq+q2=1
Hence upon rearranging we get
1p2q2=2pq
Hence 2pq=1p2q2

Note:
A de Finetti diagram can be used to graphically illustrate the genotype frequency distribution for a bi-allelic locus within a population. The distribution of the three genotype frequencies in relation to each other is represented using a triangle plot (also known as trilinear, triaxial, or ternary plot). The orientation of one of the axes has been reversed, which sets it apart from many other similar plots.