BIOLOGY 1120 EXAM 1 WITH CORRECT
ANSWERS 2025
What must each population possess that includes all the alleles for all the
loci present in the population?
a. balanced polymorphism
b. gene flow
c. gene pool
d. genotypes
e. stabilizing selection ( correct answers ) c
A(n) is the proportion of a specific allele in a particular population.
f. genetic equilibrium
g. level of fitness
h. genetic drift
i. allele frequency
j. genotype frequency ( correct answers ) d
If all the alleles of a given locus are the same in the population, what is the
frequency of that allele?
k. 10
l. 100
m.0
n. 1 ( correct answers ) d
A population with no net change over time in allele or genotype frequencies
is said to be
.
o. at genetic equilibrium
p. inbreeding
q. in genetic drift
r. stabilizing
s. an example of microevolution ( correct answers ) a
According to the Hardy-Weinberg principle, if the frequency of a dominant
allele (A) is 0.6, what must the frequency be of the recessive allele (a)?
t. 0.6
u. 0.4
v. 0.8
w.1.0
x. 0.2 ( correct answers ) b
,Suppose that p = 0.8 and q = 0.2. What would be the expected
frequency of F1 heterozygous offspring if you were to cross two parental
heterozygotes (Aa × Aa)?
a. 1.00
b. 0.64
c. 0.16
d. 0.32
e. 0.04 ( correct answers ) d
Suppose you cross Aa with Aa. What would be the frequency of AA offspring
if the frequency of the dominant allele (p) = 0.6 and the frequency of the
recessive allele (q) = 0.4?
f. 0.16
g. 0.48
h. 0.72
i. 1.00
j. 0.36 ( correct answers ) e
What term describes generation-to-generation changes in allele or
genotype frequencies within a population?
k. gene pool
l. natural selection
m.genetic drift
n. microevolution
o. mutation ( correct answers ) d
What type of selection occurs when an individual chooses its mate by its
phenotypic appearance?
p. sexual selection
q. inbreeding
r. assortative mating
s. directional selection
t. phenotypic control ( correct answers ) c
Scientists hypothesize that cheetahs almost became extinct during the Ice
Age, perhaps due to overhunting by humans, indicating that the cheetah's
genetic variation was considerably reduced by a .
u. bottleneck
v. founder effect
w.disruptive selection
x. genetic drift
y. natural selection ( correct answers ) a
What type of genetic drift is represented in the Afrikaner population of South
Africa, who are descendants of a small population of Dutch colonists?
z. founder effect
aa.directional selection
, c. gene flow
d. bottleneck
e. disruptive ( correct answers )
selection a
The optimal, and average, birth weight of 7 lbs. in human newborns is an
example of
.
a. natural selection
b. stabilizing selection
c. directional selection
d. gene selection
e. disruptive selection ( correct answers ) b
What process can lead to a splitting apart of distinct groups of
individuals within a population, often selecting against the average
phenotype?
f. stabilizing selection
g. gene selection
h. natural selection
i. directional selection
j. disruptive selection ( correct answers ) e
DNA sequencing of specific alleles in an increasing number of organisms,
including humans, indicates that are common in most populations.
k. CNVs
l. SNPs
m.variations
n. HbS alleles
o. mRNAs. ( correct answers ) b
What type of geographic variation is exhibited by the common yarrow
plant, in which taller plants are found at higher elevations and shorter
plants are found at lower elevations.
p. selective
q. disruptive
r. distributional
s. clinal
t. neutral ( correct answers ) d
According to the Hardy-Weinberg principle,
u. allele frequencies are not dependent on
dominance or recessiveness but remain
essentially unchanged from generation to
generation
v. the sum of allele frequencies for a given
locus is always greater than 1
w. if a locus has only one allele, the frequency
of that allele is zero
ANSWERS 2025
What must each population possess that includes all the alleles for all the
loci present in the population?
a. balanced polymorphism
b. gene flow
c. gene pool
d. genotypes
e. stabilizing selection ( correct answers ) c
A(n) is the proportion of a specific allele in a particular population.
f. genetic equilibrium
g. level of fitness
h. genetic drift
i. allele frequency
j. genotype frequency ( correct answers ) d
If all the alleles of a given locus are the same in the population, what is the
frequency of that allele?
k. 10
l. 100
m.0
n. 1 ( correct answers ) d
A population with no net change over time in allele or genotype frequencies
is said to be
.
o. at genetic equilibrium
p. inbreeding
q. in genetic drift
r. stabilizing
s. an example of microevolution ( correct answers ) a
According to the Hardy-Weinberg principle, if the frequency of a dominant
allele (A) is 0.6, what must the frequency be of the recessive allele (a)?
t. 0.6
u. 0.4
v. 0.8
w.1.0
x. 0.2 ( correct answers ) b
,Suppose that p = 0.8 and q = 0.2. What would be the expected
frequency of F1 heterozygous offspring if you were to cross two parental
heterozygotes (Aa × Aa)?
a. 1.00
b. 0.64
c. 0.16
d. 0.32
e. 0.04 ( correct answers ) d
Suppose you cross Aa with Aa. What would be the frequency of AA offspring
if the frequency of the dominant allele (p) = 0.6 and the frequency of the
recessive allele (q) = 0.4?
f. 0.16
g. 0.48
h. 0.72
i. 1.00
j. 0.36 ( correct answers ) e
What term describes generation-to-generation changes in allele or
genotype frequencies within a population?
k. gene pool
l. natural selection
m.genetic drift
n. microevolution
o. mutation ( correct answers ) d
What type of selection occurs when an individual chooses its mate by its
phenotypic appearance?
p. sexual selection
q. inbreeding
r. assortative mating
s. directional selection
t. phenotypic control ( correct answers ) c
Scientists hypothesize that cheetahs almost became extinct during the Ice
Age, perhaps due to overhunting by humans, indicating that the cheetah's
genetic variation was considerably reduced by a .
u. bottleneck
v. founder effect
w.disruptive selection
x. genetic drift
y. natural selection ( correct answers ) a
What type of genetic drift is represented in the Afrikaner population of South
Africa, who are descendants of a small population of Dutch colonists?
z. founder effect
aa.directional selection
, c. gene flow
d. bottleneck
e. disruptive ( correct answers )
selection a
The optimal, and average, birth weight of 7 lbs. in human newborns is an
example of
.
a. natural selection
b. stabilizing selection
c. directional selection
d. gene selection
e. disruptive selection ( correct answers ) b
What process can lead to a splitting apart of distinct groups of
individuals within a population, often selecting against the average
phenotype?
f. stabilizing selection
g. gene selection
h. natural selection
i. directional selection
j. disruptive selection ( correct answers ) e
DNA sequencing of specific alleles in an increasing number of organisms,
including humans, indicates that are common in most populations.
k. CNVs
l. SNPs
m.variations
n. HbS alleles
o. mRNAs. ( correct answers ) b
What type of geographic variation is exhibited by the common yarrow
plant, in which taller plants are found at higher elevations and shorter
plants are found at lower elevations.
p. selective
q. disruptive
r. distributional
s. clinal
t. neutral ( correct answers ) d
According to the Hardy-Weinberg principle,
u. allele frequencies are not dependent on
dominance or recessiveness but remain
essentially unchanged from generation to
generation
v. the sum of allele frequencies for a given
locus is always greater than 1
w. if a locus has only one allele, the frequency
of that allele is zero
