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

Answer 1

Answer:

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 - Correct Option (heterozygote advantage which is a type of balancing selection is the most plausible reason for high frequency in European populations that exceeds the background mutation rate in humans)

d. None of the above

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

Select one:

a. Geography

b. Allele frequencies - Correct Option (genetic difference between two population can be estimated based on the allele frequency differences)

c. Barriers to dispersal

d. All of the above

3) Migration between populations tends to homogenize / make the same allele frequencies.

Select one:

a. homogenize / make the same - Correct Option (. Migration generally tends to homogenize populations in terms of allele frequencies)

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 - Correct Option (Genetic Drift Causes Heterozygosity to Decrease within a Population over Time)

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 - Correct Option (genetic drift is more likely to occur in small populations)

b. Selection

c. Migration

d. All of the above