2nd Period Ch. 11 Evolution of Populations Quiz

A chance occurrence that negatively affects a population because the population is small.

• genetic drift
• mutation
• speciation
• migration

What do you call all of the genes in a population?

• Gene pool
• Relative Frequency
• Genetic Drift
• Allele pool

Which of the following cannot introduce new alleles into a population's gene pool?

• Mutations
• Natural selection
• Gene Flow
• Non-random mating

This mechanism of evolution occurs when populations migrate, by immigration or emigration.

• Extinction
• Gene flow
• Genetic drift
• Natural Selection

A population of pigs lives on an island together with burrowing termites. Pigs that have the longest snouts tend to survive better. Over time, most of the pig population is made up of individuals that have very long snouts. This is an example of which type of selection?

• directional selection
• disruptive selection
• stabilizing selection

Which of the following can result in a population looking more similar over time and can be described as selection against both extremes of a trait?

• directional selection
• stabilizing selection
• disruptive selection
• species selection

This is an example of

• disruptive selection
• stabilizing selection
• directional selection
• sexual selection

In the past, individuals in a population of seed eating birds had a wide variety of beak sizes. After many generations, the birds either have small beaks or large beaks, but medium size beaks are absent. If the number of birds with each beak size was graphed which example would it look like?

• A
• B
• C

A migratory bird unknowingly accumulates a few seeds of a crop plant in her feathers and drops them in an area where those plants did not live before.  This is an example of

• Founder Effect
• Predation
• Bottleneck Effect
• Migration

When a population is in Hardy-Weinberg Equilibrium.  What is not happening to the species?

• Survival
• Reproduction
• Death
• Evolution