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Evolution
Genetic
Genes and
Variation As Genetic Change &
Speciation
Random
Change
Evolution
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Many genes have at
least 2 forms, these
different forms are
known as
_______________
Alleles
A _______ _______
consists of all genes,
including all the
different alleles, that are
present in a population
Gene Pool
A __________ is
any change in a
sequence of
_____________
Mutation, DNA
What are the 2
main sources of
genetic variation?
Mutations
And
Genetic Shuffling (from
sexual reproduction)
What is the
difference between
a single-gene trait
and a polygenic
trait?
Single Gene – A trait
controlled by one gene that
has two alleles
Polygenic – a trait
controlled by two or more
genes
True or False: An
individual that dies
without reproducing will
contribute its alleles to
the gene pool.
False
___________, not
individual
organisms, can
evolve over time
Populations
Which type of selection is
shown here?
Directional
Selection
Which type of selection
is shown here?
Disruptive
Selection
What is an example
of stabilizing
selection in the real
world?
The birth weight of
human babies
A random change
in allele frequency
is called genetic
_______________
Drift
When allele frequencies
change due to migration
of a small subgroup of a
population it is known as
the __________ effect
Founder
The ________-__________
principle states that allele
frequencies in a population
will remain constant unless
one or more factors cause
those frequencies to change.
Hardy-Weinberg
What is genetic
equilibrium?
Allele frequencies
remain constant
There are five conditions
that must be met to
maintain genetic
equilibrium. Name 3 of
the 5.
1.Random Mating
2.Large Population
3.No movement into or out of the
population
4.No mutations
5.No natural selection
Speciation is the
formation of a new
_______________
Species
What organism
helped Darwin the
most with his
theory of natural
selection?
Finches
__________ isolation
occurs when two
populations are
separated by geographic
barriers such as rivers
or mountains
Geographic
_________ isolation occurs
when two populations are
capable of interbreeding
but have differences in
courtship rituals or other
___________ strategies
Behavioral,
reproductive
When would
temporal isolation
occur?
When two or more
species reproduce
at different times.
A _____________ is
a group of organisms
that breed with one
another and produce
fertile offspring
Species
A ____________ is a
group of organisms
of the same species
living in the same
area
Population
A ________-shaped
curve is typical of
polygenic traits
Bell
The ____________
____________ of an
allele is the number of
times the allele occurs in
a gene pool, compared to
all of the other genes
Relative Frequency
In genetic terms,
__________ is any
change in the relative
frequency of alleles in
a _______________
Evolution,
Population
Make your wager
The eastern meadowlark
and western meadowlark
(Birds) live in the same
area but they do not mate
because they have different
mating calls. Which type
of isolation is this?
Behavioral Isolation