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24 questions
A random change in allele frequencies over generations brought about by chance.
genetic drift
gene flow
Emigration
genetic drift
gene flow
In the 1800s, hunters killed all but twenty of a large population of northern elephant seals
genetic drift
gene flow
When allele frequencies change due to individuals leaving a population
genetic drift
gene flow
Founder effect and bottlenecks are two extreme cases
genetic drift
gene flow
Blue Jays introduce new alleles to oak forests as they make hundreds of round trips carrying acorns from oak trees a mile away to new soil in their home territory for winter.
genetic drift
gene flow.
May result when heterozygotes are selected AGAINST.
directional selection
stabilizing selection
disruptive selection
Phenotypic forms at both ends of the range are favored and the intermediate forms are selected against.
directional selection
stabilizing selection
disruptive selection
Type of selection that was seen in the beak size of the ground finch during times of drought
directional selection
stabilizing selection
disruptive selection
Type of selection seen where both sickle cell anemia and malaria are prevalent
directional selection
stabilizing selection
disruptive selection
A whale fin and shark fin are examples of
vestigial structures
homologous structures
analogous structures
A bat wing and a whale fin are examples of
vestigial structures
homologous structures
analogous structures
Hardy Weinberg invented an ideal population that was in ___ and used it as a baseline against which to measure evolution in real populations
balanced polymorphism
sexual dimorphism
genetic equilibrium
sexual selection
The unit used in studying evolution is the_______
population
individual
Cockroaches becoming increasingly resistant to pesticides is an example of
disruptive selection
genetic drift
directional selection
stabilizing selection
In the Hardy Weinberg equations the recessive phenotype frequency is represented by
p
q
2pq
q2
All of the following can allow a population to evolve EXCEPT
small population size
natural selection
mutation
no sexual selection
Counters the effect of mutations, genetic drift, and gene flow
directional selection
stabilizing selection
disruptive selection
Which type of reproduction is best when the environment is stable?
axsexual reproduction
sexual reproduction
If a population has 64% recessive phenotypes, what is the recessive allele frequency?
8%
36%
64%
80%
Natural selection acts on alleles.
True
False
Mutations are random while natural selection is NOT
True
False
The loss of a pelvic fin for fish was an advantage for lake fish but a disadvantage for ocean fish.
True
False
If the nucleotide variability of a locus is equal to 100%, what is the gene variability and number of alleles at that locus?
gene variability= 0%, # of alleles =0
gene variability = 0%, # of alleles= 1
gene variability = 0%, # of alleles >2
gene variability > 0%, # of alleles >2
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