LSUE BIOLOGY 1001 COMPREHENSIVE
REVIEW 2026 PRACTICE PAPER SOLVED
MASTER FILE
◉ During the 1950s, a scientist named Lysenko tried to solve the
food shortages in the Soviet Union by breeding wheat that could
grow in Siberia. he theorized that if individual wheat plants were
exposed to cold they would develop additional cold tolerance and
pass it to their offspring. Based on the ideas of artificial and natural
selection, do you think this project worked as planned?
A) Yes, the wheat probably evolved better cold tolerance over time
through inheritance of acquired characteristics
B) No, because Lysenko took his wheat seeds straight to Siberia
instead of exposing them incrementally to cold
C) No, because there was no process of selection based on inherited
traits. Lysenko assumed that exposure could induce a plant to
develop additional cold tolerance and that this tolerance would be
passed to the plants offspring
D) Yes, because this is generally the method used by plant breeders
to develop new cro. Answer: C) No, because there was no process of
selection based on inherited traits. Lysenko assumed that exposure
could induce a plant to develop additional cold tolerance and that
this tolerance would be passed to the plants offspring
,◉ A population of 1,000 birds exists on a small Pacific island. Some
of the birds are yellow, a characteristic determine by a recessive
allele. The others are green, a characteristic determined by a
dominant allele. A hurricane on the island kills most of the birds
from the population. Only ten remain, and those birds all have
yellow feathers. Which of the following statements is true?
A) All of the choices are correct
B) The ten remaining birds will mate only with each other, and this
will contribute to gene flow in the population
C) Assuming that no new birds come to the island and no mutations
occur, future generations of this population will contain both green
and yellow birds
D) The hurricane has caused a population bottleneck and a loss of
genetic diversity
E) This situation illustrates the effect of a mutation event. Answer:
D) The hurricane has caused population bottleneck and a loss
genetic diversity
◉ Which of the following conditions would tend to make the Hardy-
Weinberg equation more acquire for predicting the genotype
frequencies of future generation in a population of a sexually
reproducing species?
A) a small population size
, B) little gene flow with surrounding populations
C) a tendency on the part of females to mate with the healthiest
males. Answer: B) little gene flow with surrounding populations
◉ Which of the following statements regarding natural selection is
false?
A) Natural selection depends on the local environment at the
current time
B) Natural selection starts with the creation of new alleles that are
directed toward improving an organism's fitness
C) Natural selection and evolutionary change can occur in a short
period of time (a few generations)
D) Natural selection can be observed working in organisms alive
today. Answer: B) Natural selection starts with the creation of new
alleles that are directed toward improving an organism's fitness
◉ The sickle cell allele produces a serious blood disease in
homozygotes. Why doesn't natural selection eliminate this allele
from all human populations?
A) Natural selection is a positive force, so it does not elevate alleles
B) In populations where endemic malaria is present, heterozygotes
have an important advantage: They are resistant to malaria and
REVIEW 2026 PRACTICE PAPER SOLVED
MASTER FILE
◉ During the 1950s, a scientist named Lysenko tried to solve the
food shortages in the Soviet Union by breeding wheat that could
grow in Siberia. he theorized that if individual wheat plants were
exposed to cold they would develop additional cold tolerance and
pass it to their offspring. Based on the ideas of artificial and natural
selection, do you think this project worked as planned?
A) Yes, the wheat probably evolved better cold tolerance over time
through inheritance of acquired characteristics
B) No, because Lysenko took his wheat seeds straight to Siberia
instead of exposing them incrementally to cold
C) No, because there was no process of selection based on inherited
traits. Lysenko assumed that exposure could induce a plant to
develop additional cold tolerance and that this tolerance would be
passed to the plants offspring
D) Yes, because this is generally the method used by plant breeders
to develop new cro. Answer: C) No, because there was no process of
selection based on inherited traits. Lysenko assumed that exposure
could induce a plant to develop additional cold tolerance and that
this tolerance would be passed to the plants offspring
,◉ A population of 1,000 birds exists on a small Pacific island. Some
of the birds are yellow, a characteristic determine by a recessive
allele. The others are green, a characteristic determined by a
dominant allele. A hurricane on the island kills most of the birds
from the population. Only ten remain, and those birds all have
yellow feathers. Which of the following statements is true?
A) All of the choices are correct
B) The ten remaining birds will mate only with each other, and this
will contribute to gene flow in the population
C) Assuming that no new birds come to the island and no mutations
occur, future generations of this population will contain both green
and yellow birds
D) The hurricane has caused a population bottleneck and a loss of
genetic diversity
E) This situation illustrates the effect of a mutation event. Answer:
D) The hurricane has caused population bottleneck and a loss
genetic diversity
◉ Which of the following conditions would tend to make the Hardy-
Weinberg equation more acquire for predicting the genotype
frequencies of future generation in a population of a sexually
reproducing species?
A) a small population size
, B) little gene flow with surrounding populations
C) a tendency on the part of females to mate with the healthiest
males. Answer: B) little gene flow with surrounding populations
◉ Which of the following statements regarding natural selection is
false?
A) Natural selection depends on the local environment at the
current time
B) Natural selection starts with the creation of new alleles that are
directed toward improving an organism's fitness
C) Natural selection and evolutionary change can occur in a short
period of time (a few generations)
D) Natural selection can be observed working in organisms alive
today. Answer: B) Natural selection starts with the creation of new
alleles that are directed toward improving an organism's fitness
◉ The sickle cell allele produces a serious blood disease in
homozygotes. Why doesn't natural selection eliminate this allele
from all human populations?
A) Natural selection is a positive force, so it does not elevate alleles
B) In populations where endemic malaria is present, heterozygotes
have an important advantage: They are resistant to malaria and
