# What is the frequency of each genotype AA AA AA? ## What is the frequency of each genotype AA AA AA?

The frequencies of the genotypes “AA” and “Aa.” Answer: The frequency of AA is equal to p2, and the frequency of Aa is equal to 2pq. So, using the information above, the frequency of AA is 16% (i.e. p2 is 0.4 x 0.4 = 0.16) and Aa is 48% (2pq = 2 x 0.4 x 0.6 = 0.48).

## What is Hardy-Weinberg equilibrium AP Bio?

The Hardy-Weinberg Equilibrium is a model in which allele frequencies will not change if these five conditions exist: There is no mutation. (That way no new alleles are added to the gene pool). There is no type of selection acting upon the population.

How do you solve Hardy-Weinberg equilibrium?

1. Step 1: Assign the Alleles. • By convention, we use the dominant phenotype to name the alleles.
2. Step 2: Calculate q. The number of homozygous recessive individuals is q.
3. Step 3: Calculate p. Once you have q, finding p is easy!
4. Step 4: Use p and q to calculate the remaining genotypes. I always suggest that you calculate q.

What is the frequency of allele A?

Allele frequency refers to how common an allele is in a population. It is determined by counting how many times the allele appears in the population then dividing by the total number of copies of the gene. The gene pool of a population consists of all the copies of all the genes in that population.

### What is the frequency of the B allele?

The frequency of the B allele is 6/10 = 60%. A shortcut to counting the number of B alleles is to count how many BB genotypes there are, and multiply this by 2 (since each BB genotype has 2 B alleles), then add the number of Bb genotypes (since each Bb genotype has 1 B allele).

### What does the following equation represent explain p2 2pq q2 1?

The equation of p2 + 2pq + q2 = 1 represents the genotypic frequencies of a population, when it is in Hardy-Weinberg equilibrium.

What do p2 2pq and q2 represent?

The frequency of genotypes in a population can be represented by p2+2pq+q2= 1, with p2 equal to the frequency of the homozygous dominant genotype, 2pq equal to the frequency of the heterozygous genotype, and q2 equal to the frequency of the recessive genotype.

What is the Hardy-Weinberg equation for allele frequency?

(A and B) = (A) (B) Hardy-Weinberg Equations p 2 2 pq + q 2 = 1 p = frequency of the dominant allele in a population

## Will AP Biology FRQS from 2019 and earlier reflect the exam format?

Download free-response questions from past exams along with scoring guidelines, sample responses from exam takers, and scoring distributions. Because of updates to the AP Biology course and exam design after the 2019 exam, FRQs from 2019 and earlier may not directly reflect the format of questions which will appear on the 2021 and future exams.

## What are the Hardy-Weinberg equations?

(B) Hardy-Weinberg Equations p 2 2 pq + q 2 = 1 p = frequency of the dominant allele in a population p q = 1 q = frequency of the recessive allele in a population Mode = value that occurs most frequently in a data set Median = middle value that separates the greater and lesser halves of a data set

Where can I find the College Board for AP Biology questions?

Biology Free-Response Questions © 2019 The College Board. College Board, Advanced Placement, AP, AP Central, and the acorn logo are registered trademarks of the College Board. Visit the College Board on the web: collegeboard.org. AP Central is the official online home for the AP Program: apcentral.collegeboard.org. -2-

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