BIO 171 Exam 3

Natural selection

Which scientific concept did Charles Darwin and Alfred Wallace independently discover?

Male lions compete for the right to mate with females, with only one possible winner.

Which of the following situations will lead to natural selection?

•  A certain duck has a blue beak. 

• Most cheetahs live solitary lives.

Which description is an example of a phenotype?

• Squid and humans have eyes similar in structure. 

• Worms and snakes both move without legs. 

• Some bats and birds have wings that allow them to fly.

Which situation is most likely an example of convergent evolution?

A flood causes the formation of a new lake between two mountains.

Which situation would most likely lead to allopatric speciation?

longer distance between divided groups

Which variable increases the likelihood of allopatric speciation taking place more quickly?

When members of closely related species reproduce

Which reproductive combination produces hybrids?

Two species of dolphins produce offspring that always die.

Which situation is not an example of a prezygotic barrier?

Reinforcement

Which term is used to describe the continued divergence of species based on the low fitness of hybrid offspring?

A sea barrier responsible for allopatric speciation

One species of tree snail is found on a single island in the Pacific. A storm knocks down one tree that contains 50 snails and it drifts at sea for a week before coming ashore at a nearby island. The snails make it to land and over time evolve into a new snail species. This is an example of