BIOLOGY EVOLUTION PRACTICE TEST EXAM
2026 UPDATE QUESTIONS AND CORRECT
VERIFIED ANSWERS ALREADY GRADED A+
(BRAND NEW VISION)
A particular breed of hare has a coat that turns white in the winter to blend with the
snow in its environment. One winter, no snow falls and the white coats make the hares
easy for predators to see against the brown dirt. The most immediate expected result of
this environmental change is that
A. the next generation of hares will have brown winter coats
B. the hares' coats will turn to brown color
C. the hares will migrate to a snowy region
D. many of the hares will be eaten - ANS-D. many of the hares will be eaten
The use of antibiotics over the last sixty-five years has resulted in a drastic increase in
populations of bacteria that are resistant to many antibiotics. The most probable cause
of this change in bacterial populations is that
A. sanitary conditions have declined over the last sixty-five years.
B. the bacteria needed to develop resistance to antibiotics in order to survive.
C. antibiotics select for bacteria that have a degree of resistance, and against those that
don't.
D. genetic engineering has released "super bugs" that cannot be killed by antibiotics. -
ANS-C. antibiotics select for bacteria that have a degree of resistance, and
against those that don't
In biological terms, the organism that is most successful within its population is the one
that
A. captures the most food
B. occupies the most properous niche
C. grows largest and fastest
D. produces the most surviving offspring - ANS-D. produces the most surviving
offspring
The evolutionary model known as punctuated equilibrium explains why
A. long periods of stability in a species, followed by periods of rapid change
B. Charles Darwin visited the Galapagos Islands
C. the fossil record shows continuous, gradual change in species over millions of years
D. all species eventually become extinct - ANS-A. long periods of stability in a
species, followed by periods of rapid change
, 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 - 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 - 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 - 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 - 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 - 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?
A. 48%
B. 84%
C. 4%
D. 64% - ANS-A. 48%
In the phrase "Survival of the Fittest" the term "Fittest" refers to the organism's
A. suitability for its environment
2026 UPDATE QUESTIONS AND CORRECT
VERIFIED ANSWERS ALREADY GRADED A+
(BRAND NEW VISION)
A particular breed of hare has a coat that turns white in the winter to blend with the
snow in its environment. One winter, no snow falls and the white coats make the hares
easy for predators to see against the brown dirt. The most immediate expected result of
this environmental change is that
A. the next generation of hares will have brown winter coats
B. the hares' coats will turn to brown color
C. the hares will migrate to a snowy region
D. many of the hares will be eaten - ANS-D. many of the hares will be eaten
The use of antibiotics over the last sixty-five years has resulted in a drastic increase in
populations of bacteria that are resistant to many antibiotics. The most probable cause
of this change in bacterial populations is that
A. sanitary conditions have declined over the last sixty-five years.
B. the bacteria needed to develop resistance to antibiotics in order to survive.
C. antibiotics select for bacteria that have a degree of resistance, and against those that
don't.
D. genetic engineering has released "super bugs" that cannot be killed by antibiotics. -
ANS-C. antibiotics select for bacteria that have a degree of resistance, and
against those that don't
In biological terms, the organism that is most successful within its population is the one
that
A. captures the most food
B. occupies the most properous niche
C. grows largest and fastest
D. produces the most surviving offspring - ANS-D. produces the most surviving
offspring
The evolutionary model known as punctuated equilibrium explains why
A. long periods of stability in a species, followed by periods of rapid change
B. Charles Darwin visited the Galapagos Islands
C. the fossil record shows continuous, gradual change in species over millions of years
D. all species eventually become extinct - ANS-A. long periods of stability in a
species, followed by periods of rapid change
, 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 - 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 - 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 - 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 - 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 - 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?
A. 48%
B. 84%
C. 4%
D. 64% - ANS-A. 48%
In the phrase "Survival of the Fittest" the term "Fittest" refers to the organism's
A. suitability for its environment
