WorksheetsGenetic Equilibrium and Population Size Worksheet
Total questions: 54
Worksheet time: 30mins
If a population shows no change in allele frequencies over many generations, it is in genetic equilibrium.
True
False
Genetic equilibrium occurs when mutations and natural selection are active.
True
False
A large population with random mating can help maintain genetic equilibrium.
True
False
Natural disasters like earthquakes and floods can reduce population size sharply.
True
False
Disease outbreaks can cause a sudden drop in population size.
True
False
Population size always stays the same, even after disasters.
True
False
Single-gene traits are controlled by only one gene, such as a widow’s peak.
True
False
Polygenic traits are controlled by many genes, like height or skin color.
True
False
Single-gene traits always show large variation like a spectrum of heights.
True
False
Polygenic traits often show a wide range of phenotypes.
True
False
Biogeography studies where organisms live now and in the past.
True
False
Closely related species always remain identical even in different environments.
True
False
Fossils show that modern species evolved from ancient ancestors.
True
False
Earth is only 4.5 million years old.
True
False
Homologous structures have the same origin but may have different functions.
True
False
Bird wings and bee wings have the same structure and the same origin.
True
False
A dolphin’s small hip bones are vestigial structures.
True
False
All organisms have completely different genetic codes.
True
False
Hox genes help control the body layout of an embryo.
True
False
A population is a group of different species living together.
True
False
A gene pool includes all the genes in a population.
True
False
Allele frequency tells how often an allele appears in a gene pool.
True
False
Genetic drift is a random change in allele frequency.
True
False
A bottleneck effect increases population size rapidly.
True
False
The founder effect occurs when a few individuals start a new population.
True
False
Directional selection favors average individuals in a population.
True
False
Stabilizing selection favors individuals with intermediate traits.
True
False
Disruptive selection favors individuals with extreme traits.
True
False
Mutations create new genetic variation.
True
False
Lateral gene transfer is most common in mammals.
True
False
A population of butterflies shows no change in allele frequencies for many generations. What is this situation called?
Natural selection
Genetic drift
Mutation pressure
Genetic equilibrium
Which of the following could cause a dramatic decrease in population size?
Random mating
Stable climate
Natural disasters
Large population size
Which of the following is also a cause of sudden population decline?
Increased food supply
Genetic equilibrium
Disease outbreaks
Random mating
What is a single-gene trait?
A trait controlled by many genes
A trait controlled by one gene
A trait caused only by the environment
A trait that never varies
Which of the following is an example of a single-gene trait?
Which of the following is a single-gene trait?
Height
Skin color
Widow’s peak
Weight
What is a polygenic trait?
A trait controlled by one gene
A trait controlled by many genes
A trait that never changes
A trait created only by mutations
Which of the following is a polygenic trait?
Blood type
Height
Widow’s peak
Earlobe attachment
Which condition helps maintain genetic equilibrium?
Random mating
Strong natural selection
High mutation rate
Small population size
Homologous structures share a common ancestry.
Structures with similar ancestry
Structures with different ancestry
Structures found only in fossils
Analogous structures have the same function but not the same origin.
Structures with same function but different origins
Structures with same origin and same function
Structures that appear only in insects
Structures that appear only in mammals
Fossils provide evidence that species change over time.
They show how species have changed
They show only the color of organisms
They show only plant life
They show that species never change
All populations evolve at the same speed.
Different populations evolve at different speeds
All populations evolve at identical speeds
No population ever evolves
Evolution happens only in big populations
Mutations introduce new genetic variation.
Mutations create new variations
Mutations remove all variations
Mutations occur only in lab conditions
Mutations prevent evolution
Sexual reproduction alone changes allele frequencies in a population.
Sexual reproduction does not change allele frequencies by itself
Sexual reproduction changes allele frequencies instantly
Allele frequencies change only during migration
Allele frequencies stay the same in all species
The genetic code is nearly universal in all organisms.
Most organisms share the same genetic code
Each organism has a completely unique genetic code
Only mammals share the same code
Only bacteria share the same code
Genetic drift has a stronger effect on small populations.
It affects small populations more strongly
It affects all populations equally
It affects only very large populations
It never affects any population
What is a homologous structure?
Similar function, different structure
Similar structure, different function
No structure at all
Exactly identical in all species
What is an analogous structure?
Same origin, different structure
Same function, different structure
Same structure and origin
What is the gene pool?
A group of similar fossils
The place where genes are stored in DNA
All the genes in a population
A collection of dominant alleles only
What is genetic drift?
Random change in allele frequency
A structure between species
A slow type of mutation
A type of fossil formation
What defines a species?
Organisms that look alike
A group that can breed and produce fertile offspring
Animals that live in one habitat
Members of different families
What is a mutation?
No change in DNA
A fossilized structure
A change in an organism's environment
A change in the DNA sequence
Homologous structures are:
Same structure, same function
Same function, different structure
Same structure, different function
Not found in animals
