AP Biology Lab

If the frequency of two alleles in a gene pool is 90% A and 10% a, What is the frequency of the individuals in the population with genotype Aa ?

• 0.81

• 0.09

• 0.18

• 0.01

If a population experiences no migration, is very large, has no mutations, has random mating, and there is no selection, which of the following would you predict?

• The population will evolve but much more slowly than normal

• The makeup of the population's gene pool will remain virtually the same as long as these conditions hold.

• The composition of the population's gene pool will change slowly in a predictable manner.

• Dominant alleles in the population's gene pool will slowly increase in frequency, whereas recessive alleles will decrease.

In a population that is in Hardy-Weinberg equation, the frequency of the homozygous recessive genotype is 0.09. What is the frequency of individuals that are homozygous for the dominant allele?

• 0.7

• 0.21

• 0.42

• 0.49

Suppose that species 1 and species 2 have similar appearances but very divergent gene sequences, and that species 2 and species 3 have very different appearances but similar gene sequences. Which statement best reflects their relationship?

• Species 1,2,and 3 are all closely related because they either share similar appearance or similar gene sequence.

• Species 1 and 2 are most closely related because their similar appearance indicated convergent evolution

• Species 2 and 3 are most closely related because of their genetic similarity.

• Species 1 and 2 are most closely related because they share a common ancestor with species 3

Which of the following approaches would allow a biologist studying evolution of four similar species of birds to choose the best phylogenetic tree from all phylogenies?

• Choose the simplest tree that is based on physical appearances.

• From a comparison of DNA sequences, choose the tree that requires the smallest number of evolutionary events.

• Choose the tree that has the most evolutionary changes because this would be the most likely explanation for how these very similar birds evolved into four distinct species

• Determine which species can interbreed; those that can interbreed evolved from a common ancestor most recently.

What procedure would be the most useful to test the effect of selection for height at first flowering on the mean height of the plants?

• Select plants for breeding that are closest to the average height of the population.

• Use the entire population for breeding, but increase the amount of fertilizer and light.

• Select seeds from only those plants whose height exceeds the mean for the generation.

• Randomly select five plants for breeding.

In beaker b, shown in figure 4.4, what is the water potential of the distilled water and of the beet core?

• Water potential in the beaker= 0, water potential in the beet core = 0

• Water potential in the beaker= 0,

  water potential in the beet core = -0.2

• Water potential in the beaker = 0,

  water potential in the beet core = 0.2

• Water potential in the beaker cannot be calculated, water potential in the beet core = 0.2

Which of the following statements is TRUE for the diagram?

• The beet core in beaker A is at equilibrium with the surrounding water.

• The beet core in beaker B will lose water to the surrounding environment.

• The beet core in beaker B would be more turgid than the beet core in beaker A

• The beet core in beaker A is likely to gain so much water that its cells will rupture

Which graph would be the most likely result of performing the photosynthesis experiment using fresh chloroplasts placed in light and DPIP?

• A

• B

• C

• D

What is the best explanation for graph B?

• The DPIP was too pale at the beginning of the experiment.

• The chloroplast solution was too concentrated.

• The blank was not properly used to calibrate the spectrophotometer.

• The experimenter used chloroplasts that were damaged and could not respond to light.