WorksheetsNatural Selection
Total questions: 60
Worksheet time: 58mins
A gene pool consists of
all of the genes, including all the different alleles, that are present in a population
some of the genes, including the different alleles, that are present in a population
all of the genes that are present in all populations
all of the genes, including all the different alleles, that are present in all populations
The number of times a particular allele appears in a gene pool is known as the
population of the allele
relative percentage of the allele
frequency of the allele
evolution of the allele
Which answer is more appropriate?
Traits are good or bad.
Traits can be harmful or hurtful depending on the environment.
Traits are always helpful or hurtful, regardless of the environment.
Traits are helpful or bad.
Why are advantageous traits more likely to be passed onto offspring?
Because the parents are more likely to survive and reproduce.
Because they come from dominant alleles.
Because they come from recessive alleles.
Because the trait is an acquired phenotype.
Why are advantageous traits more likely to be passed onto offspring?
Because the parents are more likely to survive and reproduce.
Because they come from dominant alleles.
Because they come from recessive alleles.
Because the trait is an acquired phenotype.
Three or more alleles for a particular gene
sex linked
multiple alleles
codominance
incomplete dominance
Someone steps on some bugs and randomly removes their alleles from the population. This is an example of
gene flow
genetic drift
speciation
allele frequency
There are 3 T alleles and 7 t alleles in a population. Calculate the frequency of the recessive allele.
30%
70%
10%
4%
A drastic reduction in the size of a population that can change allele frequencies is called
the bottleneck effect
the founder effect
the gene flow effect
the Thanos effect
Alleles that improve survival will decrease in frequency in the next generation.
True
False
Which is NOT an assumption of Hardy-Weinberg?
natural selection
large populations
no mutations
no migration
random mating
If a population of lizards is isolated on an island, with no new immigrants over many years, any new genetic variations are most likely to come from
recessive alleles
natural selection
mutations
speciation
What is the frequency of the dominant allele in this population?
30%
50%
63%
37%
If all 5 Hardy-Weinberg assumptions are true, a population is said to be in genetic equilibrium. This means
it is evolving
it is not evolving
An allele combination (BB, Bb, or bb) is called a
phenotype
genotype
mutation
gene flow
Small populations are more prone to genetic drift than large populations.
True
False
Select ALL of the following that violate the Hardy-Weinberg assumptions and would lead to a change in allele frequencies in a population.
natural selection
large population
no mutations
nonrandom mating
no migration
Dog breeding is an example of
natural selection
genetic drift
speciation
artificial selection
You sample a population of butterflies and find that 42% are heterozygous for a particular gene. What would be the frequency of the recessive allele in this population?
0.30
0.49
0.70
Allele frequency cannot be estimated from this information.
Natural selection results in change in a population's _____________ traits over time.
inherited
acquired
Brown mice survive and reproduce in their desert environment better than white mice because owls can see and eat the white mice more easily. In this situation, what part of the environment is doing the selecting?
predator
soil composition
mouse fur color
sexual preferences
A phenotype that improves an organism’s chance of survival in their environment is considered a(n) ____________.
natural selection
adaption
speciation
How does a species change over time?
by adapting to the environment
changes in the gene frequencies in a population
acquiring new traits
they do not change
Which does NOT cause genetic variation?
crossing over in meiosis
mutations
acquired traits
The different forms of a gene are called
traits
pollinators
alleles
hybrids
What type of inheritance is determined by multiple genes and there can be a range of traits?
Codominance
Incomplete dominance
Polygenic traits
individuals with alleles for an extreme type are more likely to survive and reproduce
stabilizing selection
directional selection
disruptive selection
genetic drift
the selection pressure favors the extreme phenotypes, dividing the population into 2 distinct groups
directional selection
stabilizing selection
geographic selection
disruptive selection
Individuals with intermediate traits are more likely to survive and reproduce
stabilizing selection
directional selection
adaptive radiation
disruptive selection
Tall kelp have a distinct advantage over shorter kelp in receiving needed sunlight in their ocean environment
directional selection
disruptive selection
stabilizing selection
sexual selection
artificial selection
Aspen trees that are over 25 m tend to blow over in high winds; aspen that are under 15 m don't get enough sun
directional selection
stabilizing selection
disruptive selection
artificial selection
sexual selection
snails with a forward spiral and snails with a backward spiral have an advantage in their environment
directional selection
stabilizing selection
disruptive selection
artificial selection
sexual selection
Fish that produce 40,000+ eggs have greater fitness than fish that produce less than this number
directional selection
stabilizing selection
disruptive selection
artificial selection
sexual selection
Light-colored oysters would blend into the rocks in the shallows, and the darkest would blend better into the shadows. The ones in the intermediate range make them easier prey.
directional selection
stabilizing selection
disruptive selection
artificial selection
sexual selection
