LSU BIOL 1202 (Pomarico) - Final
Exam Questions and All Correct
Answers 2025-2026 Updated.
What is not a good support of evolution? - Answer Fossils
Who placed fossils in an evolutionary context? - Answer Lamarck
________ traits can be passed along to the next generation - Answer Acquired
Adaptation by _________, not by individual - Answer Population
Survival is not usually random, but is largely dependent upon heritable traits - Answer
Survival of the Fittest
__________ picks the phenotypes that will survive - Answer Nature
The result of ___________ is the adaptation of organisms to their environment - Answer
Natural Selection
________ arise by chance - Answer Variations (Mutations)
What are the two requirements that are needed to insure that natural selection occurs? -
Answer 1. Excess of offspring
2. Variation in the population
_________ changes accumulated in each generation can result in major changes over
evolutionary time - Answer Small
_________ are the oldest forms of life and also known as the simplest organisms - Answer
Prokaryotes
Structures that have similarity due to convergent evolution rather than to descent from a
common ancestor with the same traits - Answer Analogous Structures
Structures that are similar because of common ancestry - Answer Homologous Structures
,Structures that look different but have the same function
EX: insect wing & bird wing - Answer Analogous Structures
Structures that look the same but have different functions
EX: cat arm & human arm - Answer Homologous Structures
The changing of an organism over time is supported by observations from _____________ -
Answer Artificial Selection
Selective breeding encourages ________ traits - Answer Desirable
What is a good example of artificial selection? - Answer Dogs
Who has the greatest fitness? - Answer Whoever has the most offspring
___________ are the smallest relevant evolutionary unit - Answer Populations
During __________ and __________ will not alter the overall genetic makeup of a population -
Answer Meiosis
Fertilization
Will the segregation and recombination of alleles during meiosis and fertilization alter the
genetic makeup of a population? - Answer No
What are the 5 conditions needed to maintain the equilibrium (and stop evolution from
occurring)? - Answer 1. No mutations
2. No gene flow
3. Large population
4. Random mating
5. No natural selection
What is not a reason for genetic changes in individuals? - Answer Natural Selection
What is the only new source of alleles? - Answer Mutations
,________ can cause evolution by transferring alleles between populations - Answer Gene
Flow
________ is evolution by chance
EX: Flowers - Answer Genetic Drift
Only a smaller number of the population moves forward
EX: Disease wiping out 90% of the population - Answer Bottleneck Effect
A few individuals colonize a new habitat, so new forms of natural selection occur due to new
environmental pressures (such as genetic drift) - Answer Founder Effect
Direct competition among individuals of one sex (usually males) for mates of the opposite sex -
Answer Intrasexual Selection
Individuals of one sex (usually females) are choosy in selecting their mates from individuals of
the other sex (mate choice) - Answer Intersexual Selection
Which mode of natural selection shifts the population toward one extreme? - Answer
Directional
Which mode of natural selection shifts the population toward both extremes? - Answer
Disruptive
Which mode of natural selection reduces the phenotypic variation and disfavors the two
extremes? - Answer Stabilizing
In diploid individuals, who has an advantage?
EX: Sickle Cell Anemia/Malaria - Answer Heterozygous
Immigration IN of individuals into a population will not upset the equilibrium if? - Answer
They are beyond the age of reproduction
Two species of pine trees grow in the same habitat but release their pollen at different times of
the year. What kind of reproductive barrier is this? - Answer Temporal (Pre-Zygotic)
Which of the following is a common first step in the process of allopatric speciation? - Answer
Geographic Isolation
, Many species were originally distinguished by ___________ - Answer Morphology
What species category is distinguished by the ability to reproduce? - Answer Biological
What species category is distinguished by structural evidence to the molecular level? - Answer
Morphological
What species category is distinguished by behavior? - Answer Ecological
What species category is distinguished by a common ancestor - Answer Phylogenetic
How do you tell a species apart if they are asexual? - Answer Morphology
Which way of defining a species has a big grey area? - Answer Phylogenetic
What are the main two components of speciation? - Answer 1. Isolation of the population
2. Genetic diversity (mutations)
Barrier that prevents populations from interbreeding but if the species are put together they
mate - Answer Geographic
Barrier that causes isolation because of where they choose to live
EX: tree tops vs. forest floor - Answer Ecological
Barrier that prevents breeding due to the breeding seasons occurring at different times -
Answer Temporal
Barrier that occurs due to doing the wrong type of mating dance, building the wrong type of
nest, etc. - Answer Behavioral
Barrier that occurs because the "parts" don't fit - Answer Mechanical
Barrier that occurs because the sperm and egg aren't chemically matched - Answer Gametic
Exam Questions and All Correct
Answers 2025-2026 Updated.
What is not a good support of evolution? - Answer Fossils
Who placed fossils in an evolutionary context? - Answer Lamarck
________ traits can be passed along to the next generation - Answer Acquired
Adaptation by _________, not by individual - Answer Population
Survival is not usually random, but is largely dependent upon heritable traits - Answer
Survival of the Fittest
__________ picks the phenotypes that will survive - Answer Nature
The result of ___________ is the adaptation of organisms to their environment - Answer
Natural Selection
________ arise by chance - Answer Variations (Mutations)
What are the two requirements that are needed to insure that natural selection occurs? -
Answer 1. Excess of offspring
2. Variation in the population
_________ changes accumulated in each generation can result in major changes over
evolutionary time - Answer Small
_________ are the oldest forms of life and also known as the simplest organisms - Answer
Prokaryotes
Structures that have similarity due to convergent evolution rather than to descent from a
common ancestor with the same traits - Answer Analogous Structures
Structures that are similar because of common ancestry - Answer Homologous Structures
,Structures that look different but have the same function
EX: insect wing & bird wing - Answer Analogous Structures
Structures that look the same but have different functions
EX: cat arm & human arm - Answer Homologous Structures
The changing of an organism over time is supported by observations from _____________ -
Answer Artificial Selection
Selective breeding encourages ________ traits - Answer Desirable
What is a good example of artificial selection? - Answer Dogs
Who has the greatest fitness? - Answer Whoever has the most offspring
___________ are the smallest relevant evolutionary unit - Answer Populations
During __________ and __________ will not alter the overall genetic makeup of a population -
Answer Meiosis
Fertilization
Will the segregation and recombination of alleles during meiosis and fertilization alter the
genetic makeup of a population? - Answer No
What are the 5 conditions needed to maintain the equilibrium (and stop evolution from
occurring)? - Answer 1. No mutations
2. No gene flow
3. Large population
4. Random mating
5. No natural selection
What is not a reason for genetic changes in individuals? - Answer Natural Selection
What is the only new source of alleles? - Answer Mutations
,________ can cause evolution by transferring alleles between populations - Answer Gene
Flow
________ is evolution by chance
EX: Flowers - Answer Genetic Drift
Only a smaller number of the population moves forward
EX: Disease wiping out 90% of the population - Answer Bottleneck Effect
A few individuals colonize a new habitat, so new forms of natural selection occur due to new
environmental pressures (such as genetic drift) - Answer Founder Effect
Direct competition among individuals of one sex (usually males) for mates of the opposite sex -
Answer Intrasexual Selection
Individuals of one sex (usually females) are choosy in selecting their mates from individuals of
the other sex (mate choice) - Answer Intersexual Selection
Which mode of natural selection shifts the population toward one extreme? - Answer
Directional
Which mode of natural selection shifts the population toward both extremes? - Answer
Disruptive
Which mode of natural selection reduces the phenotypic variation and disfavors the two
extremes? - Answer Stabilizing
In diploid individuals, who has an advantage?
EX: Sickle Cell Anemia/Malaria - Answer Heterozygous
Immigration IN of individuals into a population will not upset the equilibrium if? - Answer
They are beyond the age of reproduction
Two species of pine trees grow in the same habitat but release their pollen at different times of
the year. What kind of reproductive barrier is this? - Answer Temporal (Pre-Zygotic)
Which of the following is a common first step in the process of allopatric speciation? - Answer
Geographic Isolation
, Many species were originally distinguished by ___________ - Answer Morphology
What species category is distinguished by the ability to reproduce? - Answer Biological
What species category is distinguished by structural evidence to the molecular level? - Answer
Morphological
What species category is distinguished by behavior? - Answer Ecological
What species category is distinguished by a common ancestor - Answer Phylogenetic
How do you tell a species apart if they are asexual? - Answer Morphology
Which way of defining a species has a big grey area? - Answer Phylogenetic
What are the main two components of speciation? - Answer 1. Isolation of the population
2. Genetic diversity (mutations)
Barrier that prevents populations from interbreeding but if the species are put together they
mate - Answer Geographic
Barrier that causes isolation because of where they choose to live
EX: tree tops vs. forest floor - Answer Ecological
Barrier that prevents breeding due to the breeding seasons occurring at different times -
Answer Temporal
Barrier that occurs due to doing the wrong type of mating dance, building the wrong type of
nest, etc. - Answer Behavioral
Barrier that occurs because the "parts" don't fit - Answer Mechanical
Barrier that occurs because the sperm and egg aren't chemically matched - Answer Gametic
