Evolution Quiz #1

A small number of lizards from a mainland population have been deposited on four isolated islands because of the effects of a rare strong storm.

Which of the following best predicts the outcome of these lizards reproducing for many generations on the islands?

• Courtship rituals specific to each island lizard species prevent the lizards from interbreeding.

• Speciation results from bottleneck events that happened before the ancestral species reached the islands.

• The different species that currently exist are the result of hybridization between lizards from different islands.

• The isolation prevents gene flow; thus, the lizards on different islands experience prezygotic isolation.

Which of the following is a true statement about natural selection?

• it is goal directed
• individuals evolve
• variation exists in a population
• acquired characteristics

Undersea landslides can disrupt marine habitats by burying organisms that live on the ocean floor. The graph above shows the size of a population of a certain organism that lives on the ocean floor. The population was affected by a recent landslide at the time indicated on the graph. Which of the following best predicts how the population will be affected by the landslide?

• The surviving organisms will evolve into a new species.

• The reduced population will likely have allelic frequencies that are different from the initial population.

• The population will adapt to deeper waters to avoid future landslides.

• The reduced population will have a greater number of different genes than the initial population.

What type of barrier inhibits the eastern and western skunks that reproduce at different times of the year (different seasons)?

• behavioral isolation

• ecological isolation

• habitat isolation

• temporal isolation

Which of the following describes the barrier that inhibits breeding of two bird species due to differences in bird song?

• behavioral isolation

• ecological isolation

• habitat isolation

• mechanical isolation

individuals with alleles for an extreme type are more likely to survive and reproduce

• stabilizing selection

• directional selection

• disruptive selection

• genetic drift

the selection pressure favors the extreme phenotypes, dividing the population into 2 distinct groups

• directional selection

• stabilizing selection

• geographic selection

• disruptive selection

Individuals with intermediate traits are more likely to survive and reproduce

• stabilizing selection

• directional selection

• adaptive radiation

• disruptive selection

What is population genetics?

• The study of genetic variation within families.

• The study of genetic variation within individuals.

• The study of genetic variation within and between populations.

• The study of genetic variation within species.

What are the five conditions required for Hardy-Weinberg equilibrium?

• Small population size, No migration, No mutation, Random mating, No natural selection

• Large population size, High migration rate, High mutation rate, Random mating, No natural selection

• Large population size, No migration, High mutation rate, Random mating, No natural selection

• Large population size, No migration, No mutation, Random mating, No natural selection