# How do you predict allele frequencies?

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## Can we predict allele frequencies within a population?

For instance, if a population does not change over time, then scientists can make certain predictions about its relative allele frequencies, and about its relative genotype frequencies. … Such a population is said to be in equilibrium.

## How does Hardy-Weinberg calculate allele frequencies?

To calculate the allelic frequencies we simply divide the number of S or F alleles by the total number of alleles: 94/128 = 0.734 = p = frequency of the S allele, and 34/128 = 0.266 = q = frequency of the F allele.

## How do you find the equilibrium frequency of an allele?

We simply rearrange the above formula so that is becomes : u(1-q) = sq2(1-q). We solve this for q to give the equilibrium allele frequency , q-hat: q = sqrt(u/s) (sqrt stands for square root).

## How do you calculate allele frequencies?

An allele frequency is calculated by dividing the number of times the allele of interest is observed in a population by the total number of copies of all the alleles at that particular genetic locus in the population. Allele frequencies can be represented as a decimal, a percentage, or a fraction.

## How do you find the frequency of a genotype example?

Example: in a population of 630 animals we count 375 animals with the genotype Z/Z, 218 with the genotype Z/z and 37 with the genotype z/z. The frequency of the three genotypes in the population is: 375/630 = 0.595; 218/630 = 0.346 en 37/630 = 0.059.

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## How do you find P and Q in Hardy Weinberg?

To find q, simply take the square root of 0.09 to get 0.3. Since p = 1 – 0.3, then p must equal 0.7. 2pq = 2 (0.7 x 0.3) = 0.42 = 42% of the population are heterozygotes (carriers).