# You asked: How do you use the Hardy Weinberg equation example?

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## How do you use the Hardy-Weinberg equation?

The Hardy-Weinberg equation used to determine genotype frequencies is: p2 + 2pq + q2 = 1. Where ‘p2‘ represents the frequency of the homozygous dominant genotype (AA), ‘2pq’ the frequency of the heterozygous genotype (Aa) and ‘q2‘ the frequency of the homozygous recessive genotype (aa).

## What is an example of Hardy-Weinberg principle?

According to the Hardy-Weinberg principle, the variable p often represents the frequency of a particular allele, usually a dominant one. For example, assume that p represents the frequency of the dominant allele, Y, for yellow pea pods.

## Why do we use the Hardy-Weinberg equation?

In population genetics studies, the Hardy-Weinberg equation can be used to measure whether the observed genotype frequencies in a population differ from the frequencies predicted by the equation.

## What question did Hardy and Weinberg want to answer?

Hardy and Weinberg wanted to answer the question; how do allele and genotype frequencies change over generations?

## What is natural selection and example?

Natural selection is the process in nature by which organisms better adapted to their environment tend to survive and reproduce more than those less adapted to their environment. For example, treefrogs are sometimes eaten by snakes and birds. … This explains the distribution of Gray and Green Treefrogs.

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## Which of the following would be an example of directional selection?

An example of directional selection is fossil records that show that the size of the black bears in Europe decreased during interglacial periods of the ice ages, but increased during each glacial period. Another example is the beak size in a population of finches.

## How do you find the Hardy-Weinberg allele frequency?

Count up the aa types and you have the observed q2. Then, take the square root of q2 to get q, and then subtract q from 1 to get p. Square p to get p2 and multiply 2*p*q to get the observed heterozygous Aa genotype frequency.

## 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 calculate allele frequency from phenotype?

Allele Frequency

1. Allele frequency is most commonly calculated using the Hardy-Weinberg equation, which describes the relationship between two alleles within a population. …
2. To find the number of alleles in a given population, you must look at all the phenotypes present. …
3. 1 = p2 + 2pq + q2