BIO 103 REAL EXAM QUESTIONS
AND ANSWER TESTBANK ALL
GRADED A+ LATEST UPDATE
2026
The largest unit within which gene flow can readily occur is a....
a. population
b. species
c. genus
d. hybrid
b. species
males in different species of the fruit fly Drosophilia that live in the same
parts of the Hawaiian Islands have different elaborate courtship rituals.
These rituals involve fighting other mates and making stylized movements
that attract females. What type of reproductive isolation does this represent?
a. Habitat isolation
b. temporal isolation
c. behavioral isolation
d. gametic isolation
c. behavioral isolation
,according to the punctuated equilibria model,
a. given enough time, most existing species will branch gradually into new
species
b. most new species accumulate their unique features relatively rapidly as
they come into existence, then change little for the rest of their duration as a
species
c. most evolution occurs in sympatric populations
d speciation is usually due to a single mutation
b. most new species accumulate their unique features relatively rapidly as
they come into existence, then change little for the rest of their duration as a
species
bird guides once listed the myrtle warbler and Audubon's warbler as distinct
species. Recently, these birds have been classified as eastern and western
forms of a single species, the yellow-rumped warbler. Which of the following
pieces, if true, would be the cause from reclassification?
a. The two forms interbreed often in nature, and their offspring survive and
reproduce well
b. the two forms live in similar habitats and have similar food requirements.
c. The two forms have many genes in common
d. the two forms are very similar in appearance.
a. The two forms interbreed often in nature, and their offspring survive and
reproduce well
which of the following would not contribute to allopatric separation?
a. the separated population is small, and genetic drift occurs
,b. the isolated population is exposed to different selection pressures than the
ancestral population
c. different mutations begin to distinguish the gene pools of the separated
populations
d. gene flow between the two populations is extensive
d. gene flow between the two populations is extensive
plant species A has a diploid number of 12. Plant species has a diploid
number of 16. A new species, C, has arisen as in allypolypoid from A and B.
The diploid number would be...
A. 14
b. 16
c. 28
d. 56
c. 28
Suppose that a group of male pied flycatchers migrated from a region where
there were no collared flycatchers to a region where both species were
present. Assuming events like this are very rare, which of the following
scenarios is least likely?
a. the frequency of hybrid offspring would increase
b. migrant pied males would produce fewer offspring than would resident
pied males
c. migrant males would mate with collared females more often than with pied
females
d. the frequency of hybrid offspring would decrease
, a. the frequency of hybrid offspring would increase
Natural selection changes allele frequencies because some _____ survive and
reproduce successfully than others.
a. alleles
b. loci
c. gene pools
d. species
e. individuals
e. individuals
No two people are genetically identical, except for identical twins. The main
source of genetic variations among humans individuals is
a. new mutations that occurred in the preceding generation
b. genetic drift due to the small evolution
c. the reshuffling of alleles in sexual reproduction
d. natural selection
e. environmental effects
c. the reshuffling of alleles in sexual reproduction
Sparrows with average-sized wings survive severe storms better than those
with longer or shorter wings, illustrating
a. the bottleneck effect
b. disruptive selection
c. frequency-dependent selection
AND ANSWER TESTBANK ALL
GRADED A+ LATEST UPDATE
2026
The largest unit within which gene flow can readily occur is a....
a. population
b. species
c. genus
d. hybrid
b. species
males in different species of the fruit fly Drosophilia that live in the same
parts of the Hawaiian Islands have different elaborate courtship rituals.
These rituals involve fighting other mates and making stylized movements
that attract females. What type of reproductive isolation does this represent?
a. Habitat isolation
b. temporal isolation
c. behavioral isolation
d. gametic isolation
c. behavioral isolation
,according to the punctuated equilibria model,
a. given enough time, most existing species will branch gradually into new
species
b. most new species accumulate their unique features relatively rapidly as
they come into existence, then change little for the rest of their duration as a
species
c. most evolution occurs in sympatric populations
d speciation is usually due to a single mutation
b. most new species accumulate their unique features relatively rapidly as
they come into existence, then change little for the rest of their duration as a
species
bird guides once listed the myrtle warbler and Audubon's warbler as distinct
species. Recently, these birds have been classified as eastern and western
forms of a single species, the yellow-rumped warbler. Which of the following
pieces, if true, would be the cause from reclassification?
a. The two forms interbreed often in nature, and their offspring survive and
reproduce well
b. the two forms live in similar habitats and have similar food requirements.
c. The two forms have many genes in common
d. the two forms are very similar in appearance.
a. The two forms interbreed often in nature, and their offspring survive and
reproduce well
which of the following would not contribute to allopatric separation?
a. the separated population is small, and genetic drift occurs
,b. the isolated population is exposed to different selection pressures than the
ancestral population
c. different mutations begin to distinguish the gene pools of the separated
populations
d. gene flow between the two populations is extensive
d. gene flow between the two populations is extensive
plant species A has a diploid number of 12. Plant species has a diploid
number of 16. A new species, C, has arisen as in allypolypoid from A and B.
The diploid number would be...
A. 14
b. 16
c. 28
d. 56
c. 28
Suppose that a group of male pied flycatchers migrated from a region where
there were no collared flycatchers to a region where both species were
present. Assuming events like this are very rare, which of the following
scenarios is least likely?
a. the frequency of hybrid offspring would increase
b. migrant pied males would produce fewer offspring than would resident
pied males
c. migrant males would mate with collared females more often than with pied
females
d. the frequency of hybrid offspring would decrease
, a. the frequency of hybrid offspring would increase
Natural selection changes allele frequencies because some _____ survive and
reproduce successfully than others.
a. alleles
b. loci
c. gene pools
d. species
e. individuals
e. individuals
No two people are genetically identical, except for identical twins. The main
source of genetic variations among humans individuals is
a. new mutations that occurred in the preceding generation
b. genetic drift due to the small evolution
c. the reshuffling of alleles in sexual reproduction
d. natural selection
e. environmental effects
c. the reshuffling of alleles in sexual reproduction
Sparrows with average-sized wings survive severe storms better than those
with longer or shorter wings, illustrating
a. the bottleneck effect
b. disruptive selection
c. frequency-dependent selection
