New World American PVT School
‫مدرسة العالم الجديد األمريكية الخاصة‬
Name:.......................................................................................... Grade: 11
Section: .......... Date:...................................
Subject: Biology
Topic: Hardy-Weinberg equilibrium.
I
Q1. Circle the word or phrase that best completes the statement.
1. The Hardy-Weinberg equation / equilibrium can be used to determine whether a dominant
and recessive allele are present in equal quantities in a population.
2. To use the Hardy-Weinberg equation, a biologist must know the frequency of emigrations
into the population / the dominant and recessive alleles.
3. If real genetic data do not match the frequencies predicted by the equation, biologists know
that the population is / is not still evolving.
Q2. Write the words from the box next to the matching descriptions in the table.
genetic drift
gene flow
mutation
sexual selection
natural selection
Factor
How It Can Lead To Evolution
a.
Allele frequencies of already existing alleles can change due to
chance alone.
b.
The movement of alleles from one population to another
changes the allele frequencies in each population.
c.
New alleles can form through mutation, creating the genetic
variation needed for evolution.
d.
Certain traits can improve reproductive success, causing
alleles for those traits to increase in frequency.
e.
Certain traits can improve survival, causing alleles for those
traits to increase in frequency.
Q3. In the table on the following page, fill in the variable or the missing information about
the variables involved in the Hardy-Weinberg equation.
Variable
What It Represents
frequency of dominant homozygous genotype
2pq
frequency of recessive homozygous genotype
p
frequency of recessive allele
n
New World American PVT School
‫مدرسة العالم الجديد األمريكية الخاصة‬
Name:.......................................................................................... Grade: 11
Section: .......... Date:...................................
Subject: Biology
Topic: Hardy-Weinberg equilibrium.
II
Q4. Choose the letter of the best answer.
1. What variable remains constant, or in equilibrium, in the Hardy-Weinberg model?
a. genetic variation
b. population
c. reproduction
d. immigration
2. What happens to a population that is in Hardy-Weinberg equilibrium?
a. It evolves much faster.
c. It evolves at a uniform pace.
b. It evolves much slower.
d. It stops evolving at all.
3. Name one way that population biologists can use Hardy-Weinberg equilibrium.
a. To compare real data to data that are predicted by a model.
b. To help them understand what can happen to a population without genetic drift.
c. To predict what will happen if a population is colonized by random immigrants.
d. To model what could occur if new alleles were added to a population.
4. Which of the following conditions could mean that a population is in Hardy-Weinberg
equilibrium?
a. The population is small.
b. Gene flow is common.
c. Mating is random.
d. Mutations occur frequently.
5. The Hardy-Weinberg equation is used to
a. estimate the rate of mutations in a population.
b. determine the likelihood of random mating.
c. calculate the gene flow rate among organisms.
d. predict genotype frequencies in a population.
6. The five factors that can lead to evolution are gene flow, genetic drift, mutation, natural
selection, and
a. sexual selection.
b.controlled mating.
c. emigration.
d.immigration.
7. Mutations are important because they bring about
a. death of the organism in which they develop.
b. genetic variation needed for a population to evolve.
c. benefits for the individual, but not for the population.
d. Hardy-Weinberg equilibrium within a population.
8. Which of the following statements applies to real populations?
a. Mutations are rarely passed to offspring.
b. Hardy-Weinberg equilibrium is rare.
c. Gene flow represses alleles for desirable traits.
d. Evolution cannot occur in large populations.
New World American PVT School
‫مدرسة العالم الجديد األمريكية الخاصة‬
Name:.......................................................................................... Grade: 11
Section: .......... Date:...................................
Subject: Biology
Topic: Hardy-Weinberg equilibrium.
III
Q5. Complete the following diagram.
Q6. Answer the following.
1.What does the Hardy-Weinberg model show?
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2. What conditions are required for a population to stay in Hardy-Weinberg equilibrium?
_________________________________________________________________
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3. What can be predicted by the Hardy-Weinberg equation?
_________________________________________________________________
4. What can be concluded if real population data do not match those predicted by the HardyWeinberg equation?
_________________________________________________________________
5. Why do real populations rarely reach Hardy-Weinberg equilibrium?
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