Transcript Types of Selection Hardy Weinberg Speciation Prezygotic vs

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