Hardy Weinberg Lesson

Let's practice hardy-weinberg. Please have your notes, calculator, something to write with.

HAPPY WEDNESDAY!

• States that a population is NOT evolving and is in a state of balanced equilibrium.

• Uses two formulas:

HARDY - WEINBERG EQUILIBRIUM

◦ p = frequency of dominant allele in a population (A)

◦ q= frequency of recessive allele in a population (a)

◦ p2 = frequency of the homozygous dominant individuals

in a population (AA)

◦ 2pq = frequency of the heterozygous individuals in a

population(Aa)

◦ q2 = frequency of the homozygous recessive individuals

in a population(aa)

ALLELE FREQUENCIES

GENOTYPIC/PHENOTYPIC
FREQUENCIES

You are always working with decimals that add up
to 1!

Guide:

1. Identify what is given.
2. Try to start with the recessive side (q or q^2).
3. Solve for q.
4. Solve for p by using the formula
5. Use the formula

if needed.

6. Provide answer in appropriate terms.

Multiple Choice

In the Hardy-Weinberg Equation, p is the frequency of what?

• The recessive allele 

• the dominant allele

• the recessive genotype

• the dominant genotype

Multiple Choice

In the Hardy-Weinberg Equation, q is the frequency of what?

• The recessive allele 

• the dominant allele

• the recessive genotype

• the dominant genotype

Multiple Choice

In the Hardy-Weinberg Equation, q² is the frequency of what?

• The recessive allele 

• the dominant allele

• the recessive genotype

• the dominant genotype

Multiple Choice

In the Hardy-Weinberg Equation, p² is the frequency of what?

• The recessive allele 

• the dominant allele

• the recessive genotype

• the dominant genotype

Multiple Choice

Which Hardy-Weinberg factor represents the frequency of heterozygous individuals in a population?

• p2

• 2pq

• q2

• p2 + 2pq

Multiple Choice

Which Hardy-Weinberg equation represents the genotype frequencies in a population?

• p + q = 1

• p2 + 2pq + q2 = 1

• p2 + pq2 + q2 = 1

• p + 2pq + q3 = 1

Multiple Select

A rather large population of foxes has 555 individuals with tan fur and 390 individuals with red fur. Assume that red is recessive.

What should you try to start with?

• p

• q

• q²

• p²

Multiple Choice

A rather large population of foxes has 555 individuals with tan fur and 390 individuals with red fur. Assume that red is recessive.

If you started with q² what do you find next?

• p

• q

• q²

• p²

Multiple Choice

A rather large population of foxes has 555 individuals with tan fur and 390 individuals with red fur. Assume that red is recessive.

Now that you have q, what should you solve for next?

• p

• q

• q²

• p²

Frequency?

Part/total

Open Ended

A rather large population of foxes has 555 individuals with tan fur and 390 individuals with red fur. Assume that red is recessive. Calculate the following: 

1. The frequencies of each allele. 

2. The frequencies of each genotype.

3. How many foxes are of the heterozygous genotype?

Multiple Choice

If the frequency of recessive allele is 0.2, what is the frequency of the homozygous recessive individuals?

• 0.04

• 0.16

• 0.4

• 0.8

Multiple Choice

A population of 150 individuals has an allele frequency of 0.3 for the dominant allele (B) and a frequency of 0.7 for the recessive allele (b). Use the Hardy-Weinberg equation to determine the frequency of the genotype (bb).

• 0.09

• 0.42

• 0.49

• 0.21

Multiple Choice

The allele frequency of p=.20 What is the frequency of the heterozygous genotype?

• .80

• .04

• .32

• .64

Multiple Choice

The allele frequency of p=.20 What is the frequency of the recessive genotype?

• .80

• .04

• .32

• .64

Multiple Choice

A population's recessive allele frequency 25%. What is the frequency of the Homozygous Dominant genotype?

• .5625

• .3750

• .0625

• .25

• .5