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Types of Selection
HardyWeinberg
SpeciationPrezygotic vs.
PostzygoticGrab Bag
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This is the only force creating genetic variation that consistently
selects for adaptive traits.
What is Natural Selection?
55
This is the type of selection that usually selects for
individuals with the average form of a trait.
What is stabilizing selection?
1010
This is the type of selection that tends to eliminate one extreme in a
range of phenotypes.
1515
What is directional selection?
This is the type of selection that may eliminate
intermediate phenotypes.
What is disruptive selection?
2020
The noticeable difference between male mallard ducks and female mallard ducks indicates that this type of
selection is important to this species.
2525
What is sexual selection?
A conditional requirement in maintaining Hardy-Weinberg Genetic equilibrium is that
non of these can occur during the copying of DNA.
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What are mutations?
This is the movement of individuals into a population; and it can disrupt
Hardy-Weinberg equilibrium.
What is immigration?
1010
This random change in the frequency of alleles has the
greatest impact on small populations.
What is a genetic drift?
1515
This is the movement of genes from one population to another and it can
effect genetic equilibrium.
What is gene flow?
2020
A female frog choosing a mate with the loudest “croak” is a violation of this conditional requirement for Hardy-
Weinberg equilibrium.
What is random mating?
2525
This type of speciation occurs as a result of the geographic isolation of
two populations.
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What is allopatric speciation?
This type of speciation occurs as a result of the reproductive isolation of
two populations.
What is sympatric speciation?
1010
This term describes the idea that species have evolved slowly over
time.
What is gradualism?
1515
This is the biological definition of a species.
What are members of a population that can mate and produce viable
and fertile offspring?
2020
This term describes the idea that species evolve at an irregular rate;
i.e. short and rapid bursts.
What is punctuated equilibrium?
2525
What is prezygotic isolation?
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The mating seasons of two types of skunks occur during different seasons.
Offspring of two individuals of interbreeding species die
early.
What is postzygotic isolation?
1010
A mule, a hybrid produced from a horse and a donkey is sterile and cannot produce
offspring of his own.
What is the postzygotic isolation?
1515
Two species of birds have different courtship rituals.
What is prezygotic isolation?
2020
Sperm cells from one sponge species cannot fertilize the eggs from
another.
What is prezygotic isolation?
2525
The study of evolution from a genetic point of view is known by
this name.
What is population Genetics?
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These are alternative versions of a gene.
What are alleles?
1010
This is the total genetic information available in a
population.
What is the gene pool?
1515
The population of California condors is currently rebounding
from 12 individuals. The population will be genetically
similar as a result of this.
What is the bottle neck effect?
2020
These are the first names of Hardy and Weinberg.
What is Godfrey Hardy and Wilhelm Weinberg?
2525
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