# Frequent question: Is it possible for genotype frequencies to change while allele frequencies remain the same?

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## Do genotype frequencies change over time?

As relative allele frequencies change, relative genotype frequencies may also change. Each genotype in the population usually has a different fitness for that particular environment.

## How are genotype frequencies related to allele frequencies?

The relative genotype frequencies show the distribution of genetic variation in a population. Relative allele frequency is the percentage of all copies of a certain gene in a population that carry a specific allele. This is an accurate measurement of the amount of genetic variation in a population.

## What is it called when the allele frequencies remain the same?

In population genetics, the Hardy–Weinberg principle, also known as the Hardy–Weinberg equilibrium, model, theorem, or law, states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.

## Can you change allele frequencies?

Simply, mutation will change allele frequencies, and hence, genotype frequencies. Lets consider a “fight” between forward and backward mutation. Forward mutation changes the A allele to the a allele at a rate (u); backward mutation changes a to A at a rate (v).

## What is frequency of a genotype?

Genotype frequency in a population is the number of individuals with a given genotype divided by the total number of individuals in the population.

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## How do you find genotype frequencies?

The frequency of genotype Aa is determined by multiplying 2 times the frequency of A times the frequency of a. The frequency of aa is determined by squaring a. Try changing p and q to other values, ensuring only that p and q always equal 1.

Genotype Expected Frequency
Aa or A1A2 pq + pq (or 2pq)
aa or A2A2 q * q = q2

## Is it possible for genotypic frequencies to change but not allelic frequencies?

Is it possible for a population’s genotype frequencies to change from one generation to the next but it’s alleles stay constant? When it comes to the possibilities of genetics the answer is always yes. As long as there is no natural selection, inbreeding or mutation, the allele frequency will remain constant.