1) The DF508 allele, which causes cystic fibrosis in homozygotes, occurs at a fr

Question

1) The DF508 allele, which causes cystic fibrosis in homozygotes, occurs at a frequency (0.02) in European populations that exceeds the background mutation rate in humans. This suggests that what process might be maintaining this relatively high allele frequency?

Select one:

a. Mutation

b. Drift

c. Selection

d. None of the above

2)

Which of the following could be used to differentiate two populations?

Select one:

a. Geography

b. Allele frequencies

c. Barriers to dispersal

d. All of the above

3) Migration between populations tends to ______ allele frequencies.

Select one:

a. homogenize / make the same

b. differentiate / make different

4) Given enough time, drift alone will tend to do what to genetic diversity in a population?

Select one:

a. Increase

b. Decrease

c. Maintain

5)

Which of the following processes will be intensified in small populations (i.e., will change allele frequencies in fewer generations)?

Select one:

a. Genetic drift

b. Selection

c. Migration

d. All of the above

Explanation / Answer

1) Selection - Positive or negative selection could be responsible for the relatively high allele frequency. Genetic drift is variation in the relative frequency of the chance disappearance of particular genes as individuals die or do not reproduce.

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