BIOLOGY
BIOLOGY EVOLUTION PRACTICE TEST
ACTUAL EXAM QUESTIONS AND
ANSWERS SOLVED 100% CORRECT 2025
According to Darwin, the driving force behind evolution is
A. gene mutation
B. natural selection
C. inheritance of acquired traits
D. larger animals eating smaller animals - Correct Ans-B. natural selection
A gene mutation in a certain flower allows the flower to produce more seeds. The seeds
each have the same chance of producing a new plant as do seeds from flowers that do
not possess this mutation. It can be expected that
A. the mutated gene will become more common in the next generation of these flowers
B. the mutation will kill the flowers that don't have the mutation
C. the other plants in the area will develop the same mutation
D. the seeds with the mutation will taste better to animals - Correct Ans-A. the mutated
gene will become more common in the next generation of these flowers
A population of people are isolated on an island, with no new immigrants over many
generations. For this group, any new genetic variations are most likely to come from
A. natural selection
B. new mutations
C. speciation
D. recessive alleles - Correct Ans-B. new mutations
Edible fruit is an adaptation in some flowering plants that provides an advantage in
A. making the plant more attractive
B. attracting bees for fertilization
C. widespread dispersal of seeds
D. getting more people to grow it - Correct Ans-C. widespread dispersal of seeds
Polydactyly (having six fingers per hand) is a hereditary condition caused by a dominant
gene. The rarity with which this condition is seen in human populations is probably
because
A. persons with polydactyly are infertile
B. the allele for polydactyly is rare
C. the trait makes people undesirable mates
D. the trait is lethal - Correct Ans-B. the allele for polydactyly is rare
In a population of white and brown rats, 16% of the rats have a white coat. Assuming
that white coat color is a recessive trait, what percentage of the rats are heterozygous
for the color allele?
BIOLOGY
, BIOLOGY
A. 48%
B. 84%
C. 4%
D. 64% - Correct Ans-A. 48%
In the phrase "Survival of the Fittest" the term "Fittest" refers to the organism's
A. suitability for its environment
B. physical strength and speed
C. number of genes
D. brain size - Correct Ans-A. suitability for its environment
Natural selection acts upon
A. only recessive alleles
B. only alleles that are the result of recent mutations
C. only dominant alleles
D. alleles that are expressed - Correct Ans-D. alleles that are expressed
In a population of white and brown rats, 16% of the rats have a white coat. Assuming
that white coat color is a recessive trait, is the frequency of the white color allele in the
population?
A. 0.04
B. 0.6
C. 0.4
D. 0.32 - Correct Ans-C. 0.4
For centuries, dog breeders have chosen to breed particular dogs to pass on, or even
enhance, desirable traits. This is an example of
A. speciation
B. natural selection
C. sexual selection
D. artificial selection - Correct Ans-D. artificial selection
Two populations of similar organisms will be considered separate species when they
A. look different
B. occupy different niches
C. become extinct
D. can no longer interbreed and produce fertile offspring - Correct Ans-D. can no longer
interbreed and produce fertile offspring
Rapid changes in the gene pool of a population are LEAST likely to occur when there is:
A. random mating and a large population
B. nonrandom mating and a small population
C. active migration and a small population
D. rapid mutation and a large population - Correct Ans-A. rapid mating and a large
population
BIOLOGY
BIOLOGY EVOLUTION PRACTICE TEST
ACTUAL EXAM QUESTIONS AND
ANSWERS SOLVED 100% CORRECT 2025
According to Darwin, the driving force behind evolution is
A. gene mutation
B. natural selection
C. inheritance of acquired traits
D. larger animals eating smaller animals - Correct Ans-B. natural selection
A gene mutation in a certain flower allows the flower to produce more seeds. The seeds
each have the same chance of producing a new plant as do seeds from flowers that do
not possess this mutation. It can be expected that
A. the mutated gene will become more common in the next generation of these flowers
B. the mutation will kill the flowers that don't have the mutation
C. the other plants in the area will develop the same mutation
D. the seeds with the mutation will taste better to animals - Correct Ans-A. the mutated
gene will become more common in the next generation of these flowers
A population of people are isolated on an island, with no new immigrants over many
generations. For this group, any new genetic variations are most likely to come from
A. natural selection
B. new mutations
C. speciation
D. recessive alleles - Correct Ans-B. new mutations
Edible fruit is an adaptation in some flowering plants that provides an advantage in
A. making the plant more attractive
B. attracting bees for fertilization
C. widespread dispersal of seeds
D. getting more people to grow it - Correct Ans-C. widespread dispersal of seeds
Polydactyly (having six fingers per hand) is a hereditary condition caused by a dominant
gene. The rarity with which this condition is seen in human populations is probably
because
A. persons with polydactyly are infertile
B. the allele for polydactyly is rare
C. the trait makes people undesirable mates
D. the trait is lethal - Correct Ans-B. the allele for polydactyly is rare
In a population of white and brown rats, 16% of the rats have a white coat. Assuming
that white coat color is a recessive trait, what percentage of the rats are heterozygous
for the color allele?
BIOLOGY
, BIOLOGY
A. 48%
B. 84%
C. 4%
D. 64% - Correct Ans-A. 48%
In the phrase "Survival of the Fittest" the term "Fittest" refers to the organism's
A. suitability for its environment
B. physical strength and speed
C. number of genes
D. brain size - Correct Ans-A. suitability for its environment
Natural selection acts upon
A. only recessive alleles
B. only alleles that are the result of recent mutations
C. only dominant alleles
D. alleles that are expressed - Correct Ans-D. alleles that are expressed
In a population of white and brown rats, 16% of the rats have a white coat. Assuming
that white coat color is a recessive trait, is the frequency of the white color allele in the
population?
A. 0.04
B. 0.6
C. 0.4
D. 0.32 - Correct Ans-C. 0.4
For centuries, dog breeders have chosen to breed particular dogs to pass on, or even
enhance, desirable traits. This is an example of
A. speciation
B. natural selection
C. sexual selection
D. artificial selection - Correct Ans-D. artificial selection
Two populations of similar organisms will be considered separate species when they
A. look different
B. occupy different niches
C. become extinct
D. can no longer interbreed and produce fertile offspring - Correct Ans-D. can no longer
interbreed and produce fertile offspring
Rapid changes in the gene pool of a population are LEAST likely to occur when there is:
A. random mating and a large population
B. nonrandom mating and a small population
C. active migration and a small population
D. rapid mutation and a large population - Correct Ans-A. rapid mating and a large
population
BIOLOGY
