1
Biology 1108 Final Questions with Answers (100%
Correct Answers)
The term "n" refers to the size of a population, that is, the number of
individuals in that population. In general, in a sample of n individuals,
the frequency of an allele is... Answer: The number of occurrences of
the allele divided by twice the number of individuals in the sample (2n).
If a population is not in Hardy-Weinberg equilibrium, we can conclude
that: Answer: Evolution has occurred because one of the assumptions
of the Hardy-Weinberg equilibrium has been violated.
The goldenrod gall fly lays its eggs on the buds of goldenrod plants.
Larvae hatch from the eggs and then chew through the goldenrod
buds and into the stems. The gall fly larvae saliva induces the
goldenrod to generate a gall (an outgrowth of tissue, a ball-shaped
swelling on the stem). The larva will live inside the gall which provides
food and shelter for the developing larva.
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,2
The larvae are prey of both parasitoid wasps and birds. Wasps
selectively prey on larvae inside the smallest galls while birds selectively
prey on larvae inside the largest galls. The size of the gall made by the
larvae is a heritable trait. Given this information, we can conclude that
the trait 'larval gall size' is subject to: Answer: stabilizing selection
You find that a wild population of antelope is not in Hardy-Weinberg
Equilibrium. From this information alone, can you determine the
mechanism of evolution operating on the population? Answer: No
A population with a novel adaptation has evolved that adaptation.
Answer: True
The peppered moth provides a well-known example of natural
selection. The light-colored form of the moth was predominant in
England before the industrial revolution. In the mid-nineteenth century,
a dark-colored form appeared. The difference is produced by a
dominant allele of one gene. By about 1900, approximately 90% of the
moths around industrial areas were dark colored, whereas light-colored
moths were still abundant elsewhere. Apparently, birds could readily
find the light moths against the soot-darkened background in industrial
areas and therefore were eating more light moths. Recently, use of
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,3
cleaner fuels has greatly reduced soot in the landscape, and the dark-
colored moths have been disappearing. Should the two forms of moths
be considered separate species Answer: No.
Three populations of crickets look very similar, but the males have
courtship songs that sound different. What function would this
difference in song likely serve if the populations came in contact?
Answer: A prezygotic isolating mechanism
How are two different species most likely to evolve from one ancestral
species? Answer: Allopatrically, after the ancestral species has split into
two populations.
Which of the following statements is true regarding hybridization?
Answer: - Hybridization occurs in plants more often than in animals
- Natural selection sometimes acts against progeny that result from
hybridization.
- Hybridization can result in fertile offspring.
- Hybridization involves the transfer of genetic material between
members of similar species.
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, 4
It is thought that polar bears originated from a population of brown
bears (Ursus arctos) that became geographically isolated during a
glaciation event that occurred about 150,000 years ago (Lindqvist et al.,
2010).
The origin of polar bears was the result of Answer: Allopatric speciation
The Sunshine periwinkle plant blooms in June while Summer periwinkle,
a close relative of Sunshine periwinkle , blooms in August. A researcher
is raising a population of Summer periwinkle in a controlled growth
chamber. Over time the researcher manipulated the day length in the
growth chamber and eventually manages to induce some individuals of
Summer periwinkle to bloom in June. The researcher finds that she can
cross these individuals with Sunshine periwinkle individuals and they
produce viable, fertile offspring. What can she conclude about
Sunshine periwinkle and Summer periwinkle? Answer: These plants are
temporally reproductively isolated from each other.
© 2025 All rights reserved
Biology 1108 Final Questions with Answers (100%
Correct Answers)
The term "n" refers to the size of a population, that is, the number of
individuals in that population. In general, in a sample of n individuals,
the frequency of an allele is... Answer: The number of occurrences of
the allele divided by twice the number of individuals in the sample (2n).
If a population is not in Hardy-Weinberg equilibrium, we can conclude
that: Answer: Evolution has occurred because one of the assumptions
of the Hardy-Weinberg equilibrium has been violated.
The goldenrod gall fly lays its eggs on the buds of goldenrod plants.
Larvae hatch from the eggs and then chew through the goldenrod
buds and into the stems. The gall fly larvae saliva induces the
goldenrod to generate a gall (an outgrowth of tissue, a ball-shaped
swelling on the stem). The larva will live inside the gall which provides
food and shelter for the developing larva.
© 2025 All rights reserved
,2
The larvae are prey of both parasitoid wasps and birds. Wasps
selectively prey on larvae inside the smallest galls while birds selectively
prey on larvae inside the largest galls. The size of the gall made by the
larvae is a heritable trait. Given this information, we can conclude that
the trait 'larval gall size' is subject to: Answer: stabilizing selection
You find that a wild population of antelope is not in Hardy-Weinberg
Equilibrium. From this information alone, can you determine the
mechanism of evolution operating on the population? Answer: No
A population with a novel adaptation has evolved that adaptation.
Answer: True
The peppered moth provides a well-known example of natural
selection. The light-colored form of the moth was predominant in
England before the industrial revolution. In the mid-nineteenth century,
a dark-colored form appeared. The difference is produced by a
dominant allele of one gene. By about 1900, approximately 90% of the
moths around industrial areas were dark colored, whereas light-colored
moths were still abundant elsewhere. Apparently, birds could readily
find the light moths against the soot-darkened background in industrial
areas and therefore were eating more light moths. Recently, use of
© 2025 All rights reserved
,3
cleaner fuels has greatly reduced soot in the landscape, and the dark-
colored moths have been disappearing. Should the two forms of moths
be considered separate species Answer: No.
Three populations of crickets look very similar, but the males have
courtship songs that sound different. What function would this
difference in song likely serve if the populations came in contact?
Answer: A prezygotic isolating mechanism
How are two different species most likely to evolve from one ancestral
species? Answer: Allopatrically, after the ancestral species has split into
two populations.
Which of the following statements is true regarding hybridization?
Answer: - Hybridization occurs in plants more often than in animals
- Natural selection sometimes acts against progeny that result from
hybridization.
- Hybridization can result in fertile offspring.
- Hybridization involves the transfer of genetic material between
members of similar species.
© 2025 All rights reserved
, 4
It is thought that polar bears originated from a population of brown
bears (Ursus arctos) that became geographically isolated during a
glaciation event that occurred about 150,000 years ago (Lindqvist et al.,
2010).
The origin of polar bears was the result of Answer: Allopatric speciation
The Sunshine periwinkle plant blooms in June while Summer periwinkle,
a close relative of Sunshine periwinkle , blooms in August. A researcher
is raising a population of Summer periwinkle in a controlled growth
chamber. Over time the researcher manipulated the day length in the
growth chamber and eventually manages to induce some individuals of
Summer periwinkle to bloom in June. The researcher finds that she can
cross these individuals with Sunshine periwinkle individuals and they
produce viable, fertile offspring. What can she conclude about
Sunshine periwinkle and Summer periwinkle? Answer: These plants are
temporally reproductively isolated from each other.
© 2025 All rights reserved
