**Contents**show

The Hardy-Weinberg Law is an equation for calculating the frequencies of different alleles and genotypes in a population in genetic equilibrium and expressed by the formula p + q = 1 where p is the frequency of the dominant allele and q is the frequency of the recessive allele.

## What does P 2 mean in Hardy-Weinberg formula?

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

## What is P and Q in allele frequencies?

p = frequency of the dominant allele in the population. q = frequency of the recessive allele in the population. p^{2} = percentage of homozygous dominant individuals.

## Why is 2pq not PQ?

Note that the heterozygotes are not 2pq but pq because in each case they are only being considered for the one allele in question. If we scale all wii’s such that the largest = 1.0 we refer to these as the relative fitnesses of the genotypes. A worked example where p = . 4, q = .

## What is 2pq?

In the equation, p^{2} represents the frequency of the homozygous genotype AA, q^{2} represents the frequency of the homozygous genotype aa, and 2pq represents the frequency of the heterozygous genotype Aa.

## What does the Q represent in the Hardy-Weinberg equation quizlet?

According to the Hardy-Weinberg equation, what does ‘q’ represent? Frequency of the recessive allele.

## Which allele is represented by the Q variable in the Hardy-Weinberg equation?

The Hardy–Weinberg principle relates allele frequencies to genotype frequencies in a randomly mating population. Imagine that you have a population with two alleles (A and B) that segregate at a single locus. The frequency of allele A is denoted by p and the frequency of allele B is denoted by q.

## Is P or Q recessive?

In the simplest system, with two alleles of the same locus (e.g. A,a), we use the symbol p to represent the frequency of the dominant allele within the population, and q for the frequency of the recessive allele.

## How do you calculate W Bar?

Take the Hardy-Weinberg equation and multiply each term (the frequency of each genotype) by the fitness of that genotype. Add those up and you get the mean fitness, w (“w-bar”).

## What is Microevolutionary change?

Microevolution is defined as changes in the frequency of a gene in a population. These are subtle changes that can occur in very short periods of time, and may not be visible to a casual observer.

## Why is the probability of DD represented by 2pq?

Dd is equal to 2pq because there are two ways to be heterozygous in a cross as illustrated in the Punnet square below. p represents the frequency of the dominant allele and q represents the frequency of the recessive allele.

## What was the purpose of Hardy and Weinberg’s work?

Hardy Weinberg’s work shows that the percentage of alleles in genepool will remain in equilibrium when there is no new mutation and evolutionary forces are not working.

## Which statement best describes the relationship between an allele’s frequency and its dominance?

Explanation: Frequency and dominance are the same thing. A dominant allele always has the highest frequency. A dominant allele usually has the highest frequency.