AP BIO MOCK EXAM QUESTIONS WITH
CORRECT ANSWERS
Arctic foxes typically have a white coat in the winter. In summer, their coat is darker.
What is most likely responsible for the seasonal change in coat color? - Answer-The
decrease in the amount of daylight in winter causes a change in gene expression, which
results in the foxes growing a lighter appearing coat.
NOT: The diet of the foxes in summer lacks a particular nutrient, which causes the foxes
to lose their white coat and grow a darker colored coat.
Some people have the ability to taste a bitter chemical called phenylthiocarbamide
(PTC). The ability to taste PTC is due to the presence of at least one dominant allele for
the PTC taste gene. The incidence of nontasters in North America is approximately
45%. Assuming the population is in Hardy-Weinberg equilibrium, what percent of the
North American population is homozygous dominant for the ability to taste PTC?
Provide your answer as a number between 0 and 1 to the nearest hundredth - Answer-*
Any value from 0.09 and 0.11
A certain species of plant has four unlike genetic loci, W, X, Y, Z. Each has one
dominant allele and one recessive allele. For a plant with the genotype WwXxYyZz,
what is the probability that the plant will produce a gamete with a haploid genotype of
Wxyz? - Answer-1/16
Thirds feed on rose pollen. Scientists noted that the thirds population increased in the
spring and decreased dramatically during the summer. The researchers hypothesized
that food abundance was the limiting factor for the population. Which type of data would
be most useful for the scientists to collect at regular intervals on a designated test plot
of rose plants? - Answer-Density of rose pollen produced (g/m^2)
NOT: The amount of pollen produced by each flower
Undersea landslides can disrupt marine habitats by burying organisms that live on the
ocean floor. The population in the graph was affected by a recent landslide. What is the
best prediction on how the population will be affected by the landslide? - Answer-The
reduced population will likely have allelic frequencies that are different from the initial
population.
NOT: The population will adapt to deeper waters to avoid future landslides.
Describe the Calvin Cycle - Answer-The reactions of the Calvin cycle add carbon to a
simple five-carbon molecule called RuBP. These reactions use chemical energy from
NADPH and ATP that were produced in the light reactions. The final product of the
cycle is glucose.
CORRECT ANSWERS
Arctic foxes typically have a white coat in the winter. In summer, their coat is darker.
What is most likely responsible for the seasonal change in coat color? - Answer-The
decrease in the amount of daylight in winter causes a change in gene expression, which
results in the foxes growing a lighter appearing coat.
NOT: The diet of the foxes in summer lacks a particular nutrient, which causes the foxes
to lose their white coat and grow a darker colored coat.
Some people have the ability to taste a bitter chemical called phenylthiocarbamide
(PTC). The ability to taste PTC is due to the presence of at least one dominant allele for
the PTC taste gene. The incidence of nontasters in North America is approximately
45%. Assuming the population is in Hardy-Weinberg equilibrium, what percent of the
North American population is homozygous dominant for the ability to taste PTC?
Provide your answer as a number between 0 and 1 to the nearest hundredth - Answer-*
Any value from 0.09 and 0.11
A certain species of plant has four unlike genetic loci, W, X, Y, Z. Each has one
dominant allele and one recessive allele. For a plant with the genotype WwXxYyZz,
what is the probability that the plant will produce a gamete with a haploid genotype of
Wxyz? - Answer-1/16
Thirds feed on rose pollen. Scientists noted that the thirds population increased in the
spring and decreased dramatically during the summer. The researchers hypothesized
that food abundance was the limiting factor for the population. Which type of data would
be most useful for the scientists to collect at regular intervals on a designated test plot
of rose plants? - Answer-Density of rose pollen produced (g/m^2)
NOT: The amount of pollen produced by each flower
Undersea landslides can disrupt marine habitats by burying organisms that live on the
ocean floor. The population in the graph was affected by a recent landslide. What is the
best prediction on how the population will be affected by the landslide? - Answer-The
reduced population will likely have allelic frequencies that are different from the initial
population.
NOT: The population will adapt to deeper waters to avoid future landslides.
Describe the Calvin Cycle - Answer-The reactions of the Calvin cycle add carbon to a
simple five-carbon molecule called RuBP. These reactions use chemical energy from
NADPH and ATP that were produced in the light reactions. The final product of the
cycle is glucose.
