Unit 3 (Section 2) Review

How does one measure how common a certain allele is within a population?

• genetic drift

• allele frequency

• gene flow

• normal distribution

The normal shuffling of alleles during meiosis results in which of the following?

• reproduction

• gene flow

• recombination

• mutations

Which type of selection is displayed by the following graph:

• directional selection

• stabilizing selection

• no selection

• disruptive selection

Which type of selection is displayed by the following graph:

• no selection

• stabilizing selection

• directional selection

• disruptive selection

Which type of selection is displayed by the following graph:

• disruptive selection

• stabilizing selection

• no selection

• directional selection

What do we call chance changes in allele frequencies within a population?

• genetic drift

• gene flow

• natural selection

• directional selection

When does the bottleneck effect occur?

• occurs after an event greatly reduces the size of a population

• occurs after a small number of individuals colonize a new area

• occurs when a population grows in size

• it never occurs

When does the founder effect occur?

• occurs after an event greatly reduces the size of a population

• occurs after a small number of individuals colonize a new area

• occurs when a population grows in size

• it never occurs

What is sexual selection?

• occurs during a bottleneck event

• occurs during meiosis

• occurs when a specific trait aids in a population's survival

• occurs when certain traits increase mating success

What is gene flow?

• movement of alleles from one population to another

• event that reduces population size

• event that decreases genetic diversity

• occurs when populations remain separate