Rokas Second Exam Questions And Answers
2026 Update!!!
Examine how processes such as mutation,
natural selection, recombination, migration, non
Microevolutionary studies random mating, and genetic drift determine as
well as change the genetic composition of
populations
Mutation Generates new variants/new alleles
Responsible for introducing new combinations
Recombinations of alleles in the population (does not introduce
new alleles.
are changes in the nucleotide sequence of DNA
and can involve changes of one (point
Mutations mutations) or many nucleotides
can cause new genes or alleles to arise
synonymous: mutations that don’t change the
encoded amino acid
How are mutations distinguished
non synonymous: changes in nucleotides that
change amino acids
Beneficial —> Increases fitness of population
harmful (deleterious) —> Decreases fitness of
population or increases the population’s
Mutations can be
susceptibility to disease
neutral—> Neither good nor bad effects for the
population
weak evolutionary force because point mutation
Mutation is a rates are generally low with one mutation every
100,000 genes per generation
, Chromosomal mutations that delete disrupt or
Mutations that are known to be harmful or rearrange loci such as deletions, duplications,
deleterious and why translocations and inversions are harmful and
deleterious
, When mutations leave genes left in tact they can
neutral or beneficial
be
it can be naturally selected to maintain the
If a mutation is beneficial
fitness of the population
Mutation is a random process with no foresight
sperm then eggs so dads contribute the most
harmful mutations
In humans the rate of point mutations is 5x why?
higher in
In sperm maturation there is more divisions and
DNA replications so there is more of an
opportunity for an error to occur.
Single celled organisms and viruses have many
Generation time in the variation in rates of
more generations per unit of time than larger
mutation
ones
Many environmental conditions can directly
Environmental impact on variation in the rate of increase the mutation rate. For example
mutation carcinogens, and other human made substances
can increase mutation rate
Under some conditions, stress increases rates of
mutation to appear adaptive.
In some cases such as in microbial organisms,
Stress impact on the variation in rates of they notice when survival is low and stress is
mutation high so they increase their mutation rates
hoping that particular mutations appear that will
be adaptive and will be favored for individuals
to survive until the next generation
When is mutation common? On a per gamete or per genome
When is mutation rare? Mutation is rare per gene
Mutations with phenotypic effects are usually harmful (deleterious) and recessive (hidden)
has a very little effect on HW equilibrium
because it takes many generations for one
particular mutation to take rise in a population
Mutation on its own so in order for it to spread in a population and
reach a proper frequency it takes a while
but it provides the ultimate raw material for
selection and evolution
2026 Update!!!
Examine how processes such as mutation,
natural selection, recombination, migration, non
Microevolutionary studies random mating, and genetic drift determine as
well as change the genetic composition of
populations
Mutation Generates new variants/new alleles
Responsible for introducing new combinations
Recombinations of alleles in the population (does not introduce
new alleles.
are changes in the nucleotide sequence of DNA
and can involve changes of one (point
Mutations mutations) or many nucleotides
can cause new genes or alleles to arise
synonymous: mutations that don’t change the
encoded amino acid
How are mutations distinguished
non synonymous: changes in nucleotides that
change amino acids
Beneficial —> Increases fitness of population
harmful (deleterious) —> Decreases fitness of
population or increases the population’s
Mutations can be
susceptibility to disease
neutral—> Neither good nor bad effects for the
population
weak evolutionary force because point mutation
Mutation is a rates are generally low with one mutation every
100,000 genes per generation
, Chromosomal mutations that delete disrupt or
Mutations that are known to be harmful or rearrange loci such as deletions, duplications,
deleterious and why translocations and inversions are harmful and
deleterious
, When mutations leave genes left in tact they can
neutral or beneficial
be
it can be naturally selected to maintain the
If a mutation is beneficial
fitness of the population
Mutation is a random process with no foresight
sperm then eggs so dads contribute the most
harmful mutations
In humans the rate of point mutations is 5x why?
higher in
In sperm maturation there is more divisions and
DNA replications so there is more of an
opportunity for an error to occur.
Single celled organisms and viruses have many
Generation time in the variation in rates of
more generations per unit of time than larger
mutation
ones
Many environmental conditions can directly
Environmental impact on variation in the rate of increase the mutation rate. For example
mutation carcinogens, and other human made substances
can increase mutation rate
Under some conditions, stress increases rates of
mutation to appear adaptive.
In some cases such as in microbial organisms,
Stress impact on the variation in rates of they notice when survival is low and stress is
mutation high so they increase their mutation rates
hoping that particular mutations appear that will
be adaptive and will be favored for individuals
to survive until the next generation
When is mutation common? On a per gamete or per genome
When is mutation rare? Mutation is rare per gene
Mutations with phenotypic effects are usually harmful (deleterious) and recessive (hidden)
has a very little effect on HW equilibrium
because it takes many generations for one
particular mutation to take rise in a population
Mutation on its own so in order for it to spread in a population and
reach a proper frequency it takes a while
but it provides the ultimate raw material for
selection and evolution
