BIOLOGY PROCTORED EXAM PENN FOSTER (2026) || MOST
RECENT EXAM 2026-2027 ACTUAL COMPLETE REAL EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ | GUARANTEED SUCCESS!! NEWEST
EXAM | JUST RELEASED!! ACE YOUR GRADES.
Explain the effects human society has had on the worlds
ecosystem: - ANSWER -Emerging Diseases: changes in human
behavior and use of technology can result in new disease
Extinction: Estimated we are loosing hundreds of species every
year due to human activity
Climate change: Changes in the normal cycles of the earths
climate that may be attributed to human activity
Greenhouse effect: Gases allow the suns ray to pass through,
but they absorb and radiate heat back to Earth
Explain Darwin's theory of natural selection - ANSWER -
Process by which organisms develop adaptations to their
environment and is the mechanism that results in evolution
over many generations
Explain Darwin's theory of evolution - ANSWER -Genetic
change in a line of
descent over time is responsible for the tremendous diversity
of life forms on
Earth
,Explain Microevolution - ANSWER -Refers to the evolutionary
changes within a
population
What are causes of microevolution? - ANSWER -Mutations:
cause genetic
variations within a breeding
population
Gene flow: occurs when alleles are exchanged between
migrating populations
of the same
species
Random Mating: Occurs when males and females mate by
chance according to
the laws of probability and not by the selection of certain
genotype or phenotype
Genetic Drift: the tendency of allele ratios to change simply by
chance
Bottleneck effect: may occur when some kind of natural
catastrophe greatly
reduces the size of a species
population
Founder effect: may occur when populations are separated to
interbreed more
,or less exclusive
over time
Describe the factors that are necessary for natural selection
to occur: - ANSWER -- Population members exhibit
differences that are heritable - Population members produce
more offspring than can be supported by the environmental
resources
- Competition exists between population members for limited
resources and results in increased survival and reproduction
of better adapted individuals - Through many generations, a
greater portion of the popopulation exhibits adaptions to the
environment and thus the population as a whole evolves
What is directional selection? - ANSWER -Occurs when an
extreme phenotype
is
favoured
- Curve shifts in one
direction
What is stabilizing selection? - ANSWER -takes place when
extreme phenotype
are selected against, thus resulting in average or
intermediate prototypes
- The peak of the curve
increases
, What is disruptive selection? - ANSWER -Occurs when 2 or
more extreme
phenotypes are favoured over
intermediate types
- The curve has 2
peaks
What is sexual selection? - ANSWER -Adaptive changes in
either sex that lead
to an increase in the ability to attract and
secure a mate
What is speciation? - ANSWER -the formation of new and
distinct species in the
course of
evolution.
What is allopatric speciation? - ANSWER -a physical
barrier divides one
population into two or more
populations
What is peripatetic speciation? - ANSWER -When small
groups of individuals
break off from the larger group and form a
new species
What is parapatric speciation? - ANSWER -A species is spread
out over a large
RECENT EXAM 2026-2027 ACTUAL COMPLETE REAL EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ | GUARANTEED SUCCESS!! NEWEST
EXAM | JUST RELEASED!! ACE YOUR GRADES.
Explain the effects human society has had on the worlds
ecosystem: - ANSWER -Emerging Diseases: changes in human
behavior and use of technology can result in new disease
Extinction: Estimated we are loosing hundreds of species every
year due to human activity
Climate change: Changes in the normal cycles of the earths
climate that may be attributed to human activity
Greenhouse effect: Gases allow the suns ray to pass through,
but they absorb and radiate heat back to Earth
Explain Darwin's theory of natural selection - ANSWER -
Process by which organisms develop adaptations to their
environment and is the mechanism that results in evolution
over many generations
Explain Darwin's theory of evolution - ANSWER -Genetic
change in a line of
descent over time is responsible for the tremendous diversity
of life forms on
Earth
,Explain Microevolution - ANSWER -Refers to the evolutionary
changes within a
population
What are causes of microevolution? - ANSWER -Mutations:
cause genetic
variations within a breeding
population
Gene flow: occurs when alleles are exchanged between
migrating populations
of the same
species
Random Mating: Occurs when males and females mate by
chance according to
the laws of probability and not by the selection of certain
genotype or phenotype
Genetic Drift: the tendency of allele ratios to change simply by
chance
Bottleneck effect: may occur when some kind of natural
catastrophe greatly
reduces the size of a species
population
Founder effect: may occur when populations are separated to
interbreed more
,or less exclusive
over time
Describe the factors that are necessary for natural selection
to occur: - ANSWER -- Population members exhibit
differences that are heritable - Population members produce
more offspring than can be supported by the environmental
resources
- Competition exists between population members for limited
resources and results in increased survival and reproduction
of better adapted individuals - Through many generations, a
greater portion of the popopulation exhibits adaptions to the
environment and thus the population as a whole evolves
What is directional selection? - ANSWER -Occurs when an
extreme phenotype
is
favoured
- Curve shifts in one
direction
What is stabilizing selection? - ANSWER -takes place when
extreme phenotype
are selected against, thus resulting in average or
intermediate prototypes
- The peak of the curve
increases
, What is disruptive selection? - ANSWER -Occurs when 2 or
more extreme
phenotypes are favoured over
intermediate types
- The curve has 2
peaks
What is sexual selection? - ANSWER -Adaptive changes in
either sex that lead
to an increase in the ability to attract and
secure a mate
What is speciation? - ANSWER -the formation of new and
distinct species in the
course of
evolution.
What is allopatric speciation? - ANSWER -a physical
barrier divides one
population into two or more
populations
What is peripatetic speciation? - ANSWER -When small
groups of individuals
break off from the larger group and form a
new species
What is parapatric speciation? - ANSWER -A species is spread
out over a large
