Download Evolution of populations exam answer key

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Evolutions of Populations Exam Answer Key
All answers are in bold print.
1) All possible genes present in a population is known as a(n)
__________________
a) Community
b) Gene Pool
c) Niche
d) Variation
2) The number of times that the allele occurs in a gene pool is referred to as
__________________
a) Allele distribution
b) Allele frequency
c) Relative frequency
d) Relative distribution
3) A genetic mutation is
a) Any change in a sequence of DNA.
b) When an organism looses a limb due to a harsh environment.
c) When genes are shuffled during the production of gametes.
d) Any change in appearance.
4) What is a major source of variations within many populations?
a) Mutations
b) Sexual reproduction
c) Natural selection
d) Speciation
5) Traits that are controlled by more than one gene are known as
_______________________
a) Dominant traits
b) Recessive traits
c) Singe-gene traits
d) Polygenic traits
6) How many phenotypes can a single-gene trait produce?
a) One
b) Two
c) Four
d) An infinite number
7) In genetic terms, evolution is any change in the ____________________ of
alleles in a(n) ______________ .
a) Phenotype, population
b) Genotype, community
c) Relative frequency, population
d) Genetic pool, genetic pool
8) How many ways can natural selection affect the distribution of phenotypes?
a) 0
b) 1
c) 2
d) 3
9) The graph below is an example of which type of natural
selection?
a) Directional selection
b) Disruptive selection
c) Stabilizing selection
d) Most natural selection
10)
The graph below is an example of which type of natural selection?
a)
b)
c)
d)
11)
a)
b)
c)
d)
Directional selection
Disruptive selection
Stabilizing selection
Most natural selection
When allele frequencies remain constant it is called
Genetic Consistency
No change frequency
Genetic stability
Genetic equilibrium
12) A change in allele frequency that results from the migration of a small
subgroup of a population is called
a) The founder effect.
b) Natural selection.
c) Genetic equilibrium.
d) The Hardy-Weinberg principle.
13) The evolution of Darwin’s finches is an example of
a) Stabilizing selection.
b) Directional selection.
c) Speciation.
d) Genetic equilibrium.
14) Allele frequency in a population will remain constant unless one or more
factors cause those frequencies to change is the main idea of
a) The law of change.
b) The principle of evolution.
c) The Hardy-Weinberg Principle.
d) Principle of Genetics.
15) When populations are separated by geographic barriers such as rivers,
mountains, or bodies of water, the population is experiencing
a) Geographic separation
b) Geographic Isolation
c) Isolation of populations
d) Separation of populations
16) When members of two populations cannot interbreed and produce fertile
offspring, ______________ isolation has occurred.
a) Behavioral
b) Reproductive
c) Temporal
d) Geographic
17) Very similar birds whose habitats overlap in the center of the United States
will not mate with each other because they use different songs to attract
mates. This is a form of what type of isolation?
a) Behavioral
b) Reproductive
c) Temporal
d) Geographic
Short Answer Questions
18) How does genetic drift take place?
When a small group of individuals colonizes a new habitat.
19) Name 3 of the 5 conditions the Hardy-Weinberg principle hold?
Three of the following: random mating; large population; no movement in or
out the population; not mutations; and no natural selection.
20) How did speciation occur in the Galapagos Finches?
It occurred by founding of a new population, geographic isolation, changes in
the new population’s gene pool, reproductive isolation, and ecological
competition.