AP Biology Practice Test 25

Test Information

Question 11 questions

Time 15 minutes

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Questions 1-4 refer to the following information.

A researcher grows a population of ferns in her laboratory. She notices, after a few generations, a new variant that has a distinct phenotype. When she tries to breed the original phenotype with the new one, no offspring are produced. When she breeds the new variants, however, offspring that look like the new variant result.

1. What originally caused the change in the variant?

2. What kind of speciation does this example illustrate?

3. Which of the following could possibly characterize the new variant?

4. Which of the following is likely to exhibit the process described earlier?

Questions 5-7 refer to the following information.

5. The DNA placed in this electrophoresis gel separates as a result of what characteristic?

6. If this gel were used in a court case as DNA evidence taken from the crime scene, which of the following suspects appears to be guilty?

7. Which two suspects, while not guilty, could possibly be identical twins?

Questions 8-11 refer to the following information.

The frequency of genotypes for a given trait are given in the accompanying graph. Answer the following questions using this information:

8. What is the frequency of the recessive homozygote?

9. What would be the approximate frequency of the heterozygote condition if this population were in Hardy-Weinberg equilibrium?

10. Is this population in Hardy-Weinberg equilibrium?

11. Which of the following processes may be occurring in this population, given the allele frequencies?