IB 150 EXAM 3 QUESTIONS WITH COMPLETE
SOLUTIONS
2pq Correct Answers % of heterozygous individuals
allele fixation Correct Answers the removal of all alleles within
a population at a particular genetic locus except one. The allele
that remains has a frequency of 100%
will cause genetic diversity to decrease bc there is no longer
variation
Assortative mating Correct Answers does NOT change allele
frequencies but it changes genotypic frequencies
biological evolution Correct Answers the change in allele
frequencies in a population over time.
ONLY applies to heritable variation in traits!
bottleneck effect Correct Answers a catastrophic event like a
natural disaster that drastically reduces the gene pool
reduces genetic diversity
can temporarily result in allele fixation due to the small
population size
bottleneck effect Correct Answers species go through an event
like a natural disaster or other density independent factors that
suddenly and significantly reduce its population and genetic
diversity
, causes of heritable variation Correct Answers mutation, random
mating, random fertilization, crossing over recombination,
independent assortment
consequences of differential survival Correct Answers
deleterious traits disappearing
makes the population less diverse because it is only favoring a
specific trait >> not as diverse
deleterious recessive allele Correct Answers maintained at low
levels, "hidden" in carriers
is immune from selection in a carrier
selection only acts on the phenotype and the recessive
phenotype is not displayed in carriers
Deletrious Alleles Correct Answers harmful alleles
the organism would not have a high fitness (successful survival
and reproduction) it will lead them to go extinct
differential survival consequences Correct Answers -"survival
of the fittest" doesn't take everything into account, since
individuals have to be able to
1.survive to reproductive age
2.find/acquire a mate
SOLUTIONS
2pq Correct Answers % of heterozygous individuals
allele fixation Correct Answers the removal of all alleles within
a population at a particular genetic locus except one. The allele
that remains has a frequency of 100%
will cause genetic diversity to decrease bc there is no longer
variation
Assortative mating Correct Answers does NOT change allele
frequencies but it changes genotypic frequencies
biological evolution Correct Answers the change in allele
frequencies in a population over time.
ONLY applies to heritable variation in traits!
bottleneck effect Correct Answers a catastrophic event like a
natural disaster that drastically reduces the gene pool
reduces genetic diversity
can temporarily result in allele fixation due to the small
population size
bottleneck effect Correct Answers species go through an event
like a natural disaster or other density independent factors that
suddenly and significantly reduce its population and genetic
diversity
, causes of heritable variation Correct Answers mutation, random
mating, random fertilization, crossing over recombination,
independent assortment
consequences of differential survival Correct Answers
deleterious traits disappearing
makes the population less diverse because it is only favoring a
specific trait >> not as diverse
deleterious recessive allele Correct Answers maintained at low
levels, "hidden" in carriers
is immune from selection in a carrier
selection only acts on the phenotype and the recessive
phenotype is not displayed in carriers
Deletrious Alleles Correct Answers harmful alleles
the organism would not have a high fitness (successful survival
and reproduction) it will lead them to go extinct
differential survival consequences Correct Answers -"survival
of the fittest" doesn't take everything into account, since
individuals have to be able to
1.survive to reproductive age
2.find/acquire a mate
